Publications

@article{PhysRevB.107.014404,
title = {Room-temperature weak collinear ferrimagnet with symmetry-driven large intrinsic magneto-optic signatures},
author = {F. Johnson and J. Zázvorka and L. Beran and D. Boldrin and L. F. Cohen and J. Zemen and M. Veis},
url = {https://link.aps.org/doi/10.1103/PhysRevB.107.014404},
doi = {10.1103/PhysRevB.107.014404},
year  = {2023},
date = {2023-01-01},
journal = {Phys. Rev. B},
volume = {107},
issue = {1},
pages = {014404},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{PhysRevB.106.144102,
title = {Analysis of atomic ordering of the ferromagnetic Co_2Fe(Ga_0.5Ge_0.5) Heusler compound using spectroscopic ellipsometry},
author = {D. Kral and P. Cejpek and J. Kudrnovsky and V. Drchal and L. Beran and E. Vilanova and G. Jakob and J. Zazvorka and R. Antos and J. Hamrle and M. Veis},
url = {https://link.aps.org/doi/10.1103/PhysRevB.106.144102},
doi = {10.1103/PhysRevB.106.144102},
year  = {2022},
date = {2022-10-01},
urldate = {2022-10-01},
journal = {Phys. Rev. B},
volume = {106},
issue = {14},
pages = {144102},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{PhysRevB.105.125204,
title = {Single-crystal studies and electronic structure investigation of the room-temperature semiconductor NaMnAs},
author = {Jiří Voln'y and Kateřina Charvátová and Martin Veis and Václav Hol'y and Martin Vondráček and Jan Honolka and Elen Duverger-Nédellec and Jakub Schusser and Sunil W. D'Souza and Jan Minár and James M. Pientka and Alberto Marmodoro and Karel V'yborn'y and Klára Uhlířová},
url = {https://link.aps.org/doi/10.1103/PhysRevB.105.125204},
doi = {10.1103/PhysRevB.105.125204},
year  = {2022},
date = {2022-03-01},
urldate = {2022-03-01},
journal = {Phys. Rev. B},
volume = {105},
issue = {12},
pages = {125204},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{wyzula2022high,
title = {High-Angular Momentum Excitations in Collinear Antiferromagnet FePS3},
author = {Jan Wyzula and Ivan Mohelský and Diana Václavková and Piotr Kapuscinski and Martin Veis and Clément Faugeras and Marek Potemski and Mike E Zhitomirsky and Milan Orlita},
url = {https://pubs.acs.org/doi/full/10.1021/acs.nanolett.2c04111},
year  = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Nano Letters},
publisher = {ACS Publications},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{watanabe2022preparation,
title = {Preparation and characterization of YMnO3 thin films by metal--organic decomposition},
author = {Kanata Watanabe and Masami Nishikawa and Hotaka Sakaguchi and Martin Veis and Takayuki Ishibashi},
url = {https://iopscience.iop.org/article/10.35848/1347-4065/ac8f9d/meta},
year  = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Japanese Journal of Applied Physics},
volume = {62},
number = {SB},
pages = {SB1005},
publisher = {IOP Publishing},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{pawbake2022high,
title = {High-Pressure Tuning of Magnon-Polarons in the Layered Antiferromagnet FePS3},
author = {Amit Pawbake and Thomas Pelini and Alex Delhomme and Davide Romanin and Diana Vaclavkova and Gerard Martinez and Matteo Calandra and Marie-Aude Measson and Martin Veis and Marek Potemski and others},
url = {https://pubs.acs.org/doi/full/10.1021/acsnano.2c04286},
year  = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {ACS nano},
volume = {16},
number = {8},
pages = {12656--12665},
publisher = {ACS Publications},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{https://doi.org/10.1002/lpor.202200067,
title = {Circular Displacement Current Induced Anomalous Magneto-Optical Effects in High Index Mie Resonators},
author = {Shuang Xia and Daria O. Ignatyeva and Qing Liu and Hanbin Wang and Weihao Yang and Jun Qin and Yiqin Chen and Huigao Duan and Yi Luo and Ondřej Novák and Martin Veis and Longjiang Deng and Vladimir I. Belotelov and Lei Bi},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/lpor.202200067},
doi = {https://doi.org/10.1002/lpor.202200067},
year  = {2022},
date = {2022-01-01},
journal = {Laser & Photonics Reviews},
volume = {16},
number = {8},
pages = {2200067},
abstract = {Abstract Dielectric Mie nanoresonators showing strong light–matter interaction at the nanoscale may enable new functionality in photonic devices, such as strong magneto-optical effects. However, most reports so far have been focused on the enhancement of conventional magneto-optical effects. Here, anomalous magneto-optical effects are observed in high-index-contrast Si/Ce:YIG/YIG/SiO2 Mie resonators. In particular, giant modulation of light intensity in transverse magnetic configuration up to 6.4% under s-polarized incidence appears, which is non-existent in planar magneto-optical thin films. A large rotation of transmitted light polarization in longitudinal magnetic configuration is also observed, which is two orders of magnitude higher than for planar magneto-optical thin films. These phenomena are originated from the unique circular displacement current when exciting magnetic resonances in the Mie resonators, which change the electric field direction locally. This work indicates an uncharted territory of light polarization control based on complex modal profiles in all-dielectric magneto-optical Mie resonators and metasurfaces.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{xia2022enhancement,
title = {Enhancement of the Faraday effect and magneto-optical figure of merit in all-dielectric metasurfaces},
author = {Shuang Xia and Daria O Ignatyeva and Qing Liu and Jun Qin and Tongtong Kang and Weihao Yang and Yiqin Chen and Huigao Duan and Longjiang Deng and Di Long and others},
url = {https://pubs.acs.org/doi/full/10.1021/acsphotonics.1c01692},
year  = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {ACS Photonics},
volume = {9},
number = {4},
pages = {1240--1247},
publisher = {ACS Publications},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{KRATOCHVILOVA2022125590,
title = {The surface degradation and its impact on the magnetic properties of bulk VI3},
author = {M. Kratochvílová and K. Uhlířová and M. Míšek and V. Holý and J. Zázvorka and M. Veis and J. Pospíšil and S. Son and J. -G. Park and V. Sechovský},
url = {https://www.sciencedirect.com/science/article/pii/S0254058421013730},
doi = {https://doi.org/10.1016/j.matchemphys.2021.125590},
issn = {0254-0584},
year  = {2022},
date = {2022-01-01},
journal = {Materials Chemistry and Physics},
volume = {278},
pages = {125590},
abstract = {Despite belonging to a well-studied family of transition metal trihalides, VI3 has received significant attention only recently. As a hard ferromagnetic van der Waals compound with a large coercivity, it attracted much attention because of its potential use in atomically thin spintronic and optoelectronic devices. However, practical exploration of VI3 is challenging due to its instability under ambient conditions. Here, we present a comprehensive set of optical, x-ray diffraction, magnetization, and ellipsometric measurements of VI3 and demonstrate that, similarly to the related van der Waals ferromagnet CrI3, the degradation process is accelerated by the presence of moisture. The VI3 surface was covered by selected media commonly used in physical measurements to test its stability and lower the degradation rate three times or higher, providing practical information for experimentalists interested. The decomposition study at ambient conditions shows that the VI3 single crystal can be used for most of the bulk, magnetization, and optical measurements without any noticeable change of physical properties, as the significant degradation appears first after ∼2 h of exposition as illustrated, e.g., by the evolution of the ferromagnetic T1 and T2 transitions. The ellipsometric measurement demonstrates that even the surface remains optically stable for at least 5 min.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{stejskal2022flow,
title = {The flow of the Berry curvature vector field},
author = {Ondřej Stejskal and Martin Veis and Jaroslav Hamrle},
url = {https://www.nature.com/articles/s41598-021-04076-z},
year  = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Scientific Reports},
volume = {12},
number = {1},
pages = {1--6},
publisher = {Nature Publishing Group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{gruber2022skyrmion,
title = {Skyrmion pinning energetics in thin film systems},
author = {Raphael Gruber and Jakub Zázvorka and Maarten A Brems and Davi R Rodrigues and Takaaki Dohi and Nico Kerber and Boris Seng and Mehran Vafaee and Karin Everschor-Sitte and Peter Virnau and others},
url = {https://www.nature.com/articles/s41467-022-30743-4},
year  = {2022},
date = {2022-01-01},
urldate = {2022-01-01},
journal = {Nature Communications},
volume = {13},
number = {1},
pages = {1--9},
publisher = {Nature Publishing Group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{RN739,
title = {Band structure analysis of the magneto-optical effect in bcc Fe},
author = {Ondřej Stejskal and Martin Veis and Jaroslav Hamrle},
doi = {10.1038/s41598-021-00478-1},
issn = {2045-2322},
year  = {2021},
date = {2021-11-01},
journal = {Scientific Reports},
volume = {11},
number = {1},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{RN740,
title = {High Figure of Merit Magneto‐Optical Ce‐ and Bi‐Substituted Terbium Iron Garnet Films Integrated on Si},
author = {Takian Fakhrul and Stana Tazlaru and Bharat Khurana and Lukáš Beran and Jackson Bauer and Michal Vančík and Ariane Marchese and Ekaterina Tsotsos and Miroslav Kučera and Yan Zhang and Martin Veis and Caroline A Ross},
doi = {10.1002/adom.202100512},
issn = {2195-1071},
year  = {2021},
date = {2021-05-31},
journal = {Advanced Optical Materials},
volume = {9},
number = {16},
pages = {2100512},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Tikuisis2021,
title = {Landau level spectroscopy of the PbSnSe topological crystalline insulator},
author = {Kristupas Kazimieras Tikuišis and Jan Wyzula and Lukáš Ohnoutek and Petr Cejpek and Klára Uhlířová and Michael Hakl and Clément Faugeras and Karel V{ý}born{ý} and Akihiro Ishida and Martin Veis and Milan Orlita},
url = {https://link.aps.org/doi/10.1103/PhysRevB.103.155304},
doi = {10.1103/PhysRevB.103.155304},
issn = {2469-9950},
year  = {2021},
date = {2021-04-12},
journal = {Physical Review B},
volume = {103},
number = {15},
pages = {155304},
abstract = {We report on an infrared magnetospectroscopy study of Pb 1−x Sn x Se, a topological crystalline insulator. We have examined a set of samples, all in the inverted regime of electronic bands, with the tin composition varying from x = 0.2 to 0.33. Our analysis shows that the observed response, composed of a series of interband inter-Landau-level excitations, can be interpreted and modeled using the relativistic-like Hamiltonian for three-dimensional massive Dirac electrons, expanded to include diagonal quadratic terms that impose band inversion. In our data, we have not found any clear signature of massless electron states that are present on the surface of Pb 1−x Sn x Se crystals in the inverted regime. Reasons for this unexpected result are discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Hrabovsky2021,
title = {Optical characterization of Y3Al5O12 and Lu3Al5O12 single crystals},
author = {J Hrabovsk{ý} and M Ku{č}era and L Paloušová and L Bi and M Veis},
url = {https://doi.org/10.1364/OME.417670 https://www.osapublishing.org/abstract.cfm?URI=ome-11-4-1218},
doi = {10.1364/ome.417670},
issn = {2159-3930},
year  = {2021},
date = {2021-04-01},
journal = {Optical Materials Express},
volume = {11},
number = {4},
pages = {1218},
abstract = {In this work spectrally dependent optical parameters of nominally pure single crystals of yttrium aluminum garnet (YAG) and lutetium aluminum garnet (LuAG) were studied using spectroscopy ellipsometry together with transmittance measurements in a broad spectral range from 0.73 to 6.42 eV (193–1700 nm). Obtained data in terms of complex refractive index and reflectivity represent an extension of previous studies towards the ultraviolet spectral region and provide a background for the design of a variety of optical applications such as laser host matrix systems, doped luminescence materials, optical imaging devices for semiconductor immersion lithography, construction of scintillators and other devices operating in the ultraviolet spectral region. A complete database of obtained optical parameters (real and imaginary parts of complex refractive index) in the whole spectral range is included in the supplementary part.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Kerber2021,
title = {Anisotropic Skyrmion Diffusion Controlled by Magnetic-Field-Induced Symmetry Breaking},
author = {Nico Kerber and Markus Weißenhofer and Klaus Raab and Kai Litzius and Jakub Zázvorka and Ulrich Nowak and Mathias Kläui},
doi = {10.1103/PhysRevApplied.15.044029},
issn = {23317019},
year  = {2021},
date = {2021-03-29},
journal = {Physical Review Applied},
volume = {15},
number = {4},
pages = {44029},
abstract = {The diffusion of particles has wide repercussions, ranging from particle-based soft-matter systems to solid-state systems with particular electronic properties. Recently, in the field of magnetism, the diffusion of magnetic skyrmions, topologically stabilized quasiparticles, has been demonstrated. Here, we show that, by applying a magnetic in-plane field, and therefore, breaking the symmetry of the system, skyrmion diffusion becomes anisotropic, with faster diffusion parallel to the field axis and slower diffusion perpendicular to it. We furthermore show that the absolute value of the applied magnetic in-plane field controls the absolute values of the diffusion coefficients, so that one can thereby tune both the orientation of the diffusion and its strength. Based on the stochastic Thiele equation, we can explain the observed anisotropic diffusion as a result of the elliptical deformation of the skyrmions by the application of the in-plane field.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Jesko2021,
title = {Spectral permittivity tensor and density functional theory calculations on the Heusler compound Co2FeAl0.5Si0.5},
author = {Radek Ješko and Ondřej Stejskal and Robin Silber and Lukáš Beran and Martin Veis and Ahmad Omar and Jaroslav Hamrle},
doi = {10.1103/PhysRevB.103.075146},
issn = {24699969},
year  = {2021},
date = {2021-02-25},
journal = {Physical Review B},
volume = {103},
number = {7},
pages = {75146},
abstract = {The Heusler compound Co2FeAl0.5Si0.5 is an interesting material for spintronic applications due to its predicted half-metal ferromagnetic character with a large band gap in the minority states. In this work, we present the optical and magneto-optical properties of a Co2FeAl0.5Si0.5 bulk sample at room temperature. The spectral permittivity is found to be dominated by an absorption peak at 1.4 eV, originating mostly from absorptions by minority electrons. The best agreement between the experimentally obtained spectral permittivity tensor and the ab initio calculated one is for the local density approximation potential, closely followed by the generalized gradient approximation potential. However, the half-metallic ferromagnet character with 100% spin polarization is preserved only in calculations employing the Coulomb interaction correction (+U). This suggests that Co2FeAl0.5Si0.5 is probably not a half metal as a single minority d-band dips below the Fermi level.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Mazalski2021,
title = {Ultrathin Co films with Pt and Au covers - Magnetic and structural properties driven by Ga+ion irradiation},
author = {P Mazalski and L Ohnoutek and I Sveklo and L Beran and Z Kurant and W Powro{ź}nik and A Wawro and M O Liedke and M Butterling and A Wagner and J Fassbender and J Hamrle and R Antoš and V Kletecka and M Veis and A Maziewski},
url = {https://doi.org/10.1088/1367-2630/abde6d https://iopscience.iop.org/article/10.1088/1367-2630/abde6d},
doi = {10.1088/1367-2630/abde6d},
issn = {13672630},
year  = {2021},
date = {2021-02-11},
journal = {New Journal of Physics},
volume = {23},
number = {2},
pages = {023015},
abstract = {The X/Co 3 nm/Y (where X},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Kratochvilova2021,
title = {Systematic experimental search for Fe2YZ Heusler compounds predicted by ab-initio calculation},
author = {M Kratochvílová and M Klicpera and F Mal{ý} and J Valenta and M Veis and R H Colman and O Heczko},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0966979520309778},
doi = {10.1016/j.intermet.2020.107073},
issn = {09669795},
year  = {2021},
date = {2021-02-03},
journal = {Intermetallics},
volume = {131},
pages = {107073},
publisher = {Elsevier Ltd},
abstract = {An extensive experimental investigation of Fe-based Heusler alloys has been performed in order to potentially prepare new materials which are tetragonally distorted and have large perpendicular magnetic anisotropy crucial not only for the STT-MRAM applications but also for magnetic shape memory devices. Based on criteria demanded for the MSM applications 25 Fe2YZ various compounds were selected for the synthesis using arc melting from more than 60 systems suggested theoretically. Only four compounds Fe2MnSn, Fe2NiSi, Fe2NiGe, and Fe3Ga were homogeneous single phase. None of the studied Fe-based materials exhibited the predicted tetragonal structure. Magnetic measurements confirmed that all investigated compounds are soft ferromagnets with no sign of a structural transition. Our results contradict the ab-initio calculations showing the limits of theoretical predictions by incomplete high throughput calculations as well as the limitations of the standard synthesis techniques.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Lenz2021,
title = {Imaging Topological Spin Structures Using Light-Polarization and Magnetic Microscopy},
author = {Till Lenz and Georgios Chatzidrosos and Zhiyuan Wang and Lykourgos Bougas and Yannick Dumeige and Arne Wickenbrock and Nico Kerber and Jakub Zázvorka and Fabian Kammerbauer and Mathias Kläui and Zeeshawn Kazi and Kai-Mei C Fu and Kohei M Itoh and Hideyuki Watanabe and Dmitry Budker},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.15.024040},
doi = {10.1103/PhysRevApplied.15.024040},
issn = {2331-7019},
year  = {2021},
date = {2021-02-01},
journal = {Physical Review Applied},
volume = {15},
number = {2},
pages = {024040},
abstract = {We present an imaging modality that enables detection of magnetic moments and their resulting stray magnetic fields. We use wide-field magnetic imaging that employs a diamond-based magnetometer and has combined magneto-optic detection (e.g., magneto-optic Kerr effect) capabilities. We employ such an instrument to image magnetic (stripe) domains in multilayered ferromagnetic structures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zazvorka2020,
title = {Skyrmion Lattice Phases in Thin Film Multilayer},
author = {Jakub Zázvorka and Florian Dittrich and Yuqing Ge and Nico Kerber and Klaus Raab and Thomas Winkler and Kai Litzius and Martin Veis and Peter Virnau and Mathias Kläui},
url = {https://onlinelibrary.wiley.com/doi/10.1002/adfm.202004037},
doi = {10.1002/adfm.202004037},
issn = {1616-301X},
year  = {2020},
date = {2020-11-01},
journal = {Advanced Functional Materials},
volume = {30},
number = {46},
pages = {2004037},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Stejskal2020,
title = {Current distribution in metallic multilayers from resistance measurements},
author = {Ondřej Stejskal and André Thiaville and Jaroslav Hamrle and Shunsuke Fukami and Hideo Ohno},
url = {https://link.aps.org/doi/10.1103/PhysRevB.101.235437},
doi = {10.1103/PhysRevB.101.235437},
issn = {2469-9950},
year  = {2020},
date = {2020-06-01},
journal = {Physical Review B},
volume = {101},
number = {23},
pages = {235437},
abstract = {The in-plane current profile within multilayers of the generic structure Ta/Pt/(CoNi)/Pt/Ta is investigated. A large set of samples where the thickness of each layer was systematically varied was grown, followed by the measurement of the sheet resistance of each sample. The data are analyzed by a series of increasingly elaborate models, from a macroscopic engineering approach to mesoscopic transport theory. Non-negligible variations of the estimated repartition of current between the layers are found. The importance of having additional structural data is highlighted.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Silber2020,
title = {Scaling of quadratic and linear magneto-optic Kerr effect spectra with L2 1 ordering of Co 2 MnSi Heusler compound},
author = {Robin Silber and Daniel Král and Ondřej Stejskal and Takahide Kubota and Yasuo Ando and Jaromír Pištora and Martin Veis and Jaroslav Hamrle and Timo Kuschel},
url = {http://aip.scitation.org/doi/10.1063/5.0008427},
doi = {10.1063/5.0008427},
issn = {0003-6951},
year  = {2020},
date = {2020-06-01},
journal = {Applied Physics Letters},
volume = {116},
number = {26},
pages = {262401},
publisher = {American Institute of Physics Inc.},
abstract = {Spectral ellipsometry is a useful technique allowing fast, nondestructive, and contactless characterization of thin films and constituent materials. In this Letter, we show that both the linear magneto-optic Kerr effect (LinMOKE, proportional to the magnetization M) and the quadratic MOKE (QMOKE, proportional to M 2) can be a useful extension of spectral ellipsometry and are able to sense the crystallographic ordering of Heusler compounds. This is demonstrated for the Heusler compound Co2MnSi, which has a crystallographic transition from a B2 to an L21 structure with increasing annealing temperature Ta. We investigated a set of Co2MnSi thin films deposited on MgO(001) substrates and annealed from 300 to 500 °C. The amplitude of LinMOKE and QMOKE spectra, detected in the extended visible spectral range of 0.8-5.5 eV, scales linearly with Ta, and this effect is pronounced at the resonant peaks of the QMOKE spectra below 2.0 eV. Furthermore, the spectra of the magneto-optic (MO) parameters, which fully describe the MO response of Co2MnSi up to the second order in M, are obtained depending on Ta. Finally, the spectra are compared with ab initio calculations of a purely L21-ordered Co2MnSi Heusler compound.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Kratochvilova2020,
title = {Fe2MnSn – Experimental quest for predicted Heusler alloy},
author = {M Kratochvílová and D Král and M Dušek and J Valenta and R H Colman and O Heczko and M Veis},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0304885319333128},
doi = {10.1016/j.jmmm.2020.166426},
issn = {03048853},
year  = {2020},
date = {2020-05-01},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {501},
pages = {166426},
publisher = {Elsevier B.V.},
abstract = {Fe2MnSn compound was prepared in the form of polycrystalline ingot by arc-melting. In contrast to the theoretical predictions of stable tetragonal Heusler compound, the material crystallizes in a hexagonal DO19 crystal structure and orders ferromagnetically below TC = 586(10) K that is only about half of the calculated value of 1012 K. Magnetic moment 5.87 $mu$B at 10 K is less or about in line with various theoretical predictions. However, electrical resistivity and optical studies reveal no signs of half-metallic behavior predicted theoretically. The change in the slope of the MOKE spectra below 1.5 eV suggests the main influence of a low energy inter-band transition which points to the loss of half-metallicity in agreement with resistivity and optical measurements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Antos2020,
title = {Coupled wave method with modified boundary conditions for diffraction grating calculations},
author = {Roman Antos and Martin Veis},
url = {https://doi.org/10.35848/1347-4065/ab6cb2 https://iopscience.iop.org/article/10.35848/1347-4065/ab6cb2},
doi = {10.35848/1347-4065/ab6cb2},
issn = {0021-4922},
year  = {2020},
date = {2020-04-01},
journal = {Japanese Journal of Applied Physics},
volume = {59},
number = {SE},
pages = {SEEB02},
abstract = {The Fourier modal method for grating diffraction calculations is reformulated to improve its numerical performance, which is then studied on a rectangular aluminium grating. The Fourier coefficients of the rectangular permittivity function are calculated by the discrete Fourier transform from equidistant sample points rather than from the Fourier integral, which partially suppresses the Gibbs phenomenon. The continuous field components are treated in the Fourier space analogously to the conventional algorithm, whereas the discontinuous components are calculated in the direct space. The lateral component of the electric field, which is discontinuous inside the periodic medium but continuous on horizontal interfaces, is used for the boundary conditions in the direct space, which improves the convergence of diffraction efficiencies and considerably suppresses field fluctuations in the vicinity of sharp corners.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Kral2020,
title = {Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds},
author = {Daniel Král and Lukáš Beran and Martin Zelený and Jan Zemen and Roman Antoš and Jaroslav Hamrle and Jakub Zázvorka and Michal Rameš and Kristýna Onderková and Oleg Heczko and Martin Veis},
url = {https://www.mdpi.com/1996-1944/13/3/703},
doi = {10.3390/ma13030703},
issn = {1996-1944},
year  = {2020},
date = {2020-02-01},
journal = {Materials},
volume = {13},
number = {3},
pages = {703},
publisher = {Multidisciplinary Digital Publishing Institute},
abstract = {Fe75−xMn25Gax Heusler-like compounds were investigated in a wide range of Fe/Ga ratios while keeping the Mn content constant and equal 25 at% in order to elucidate the interplay between magnetic properties and composition. Materials were prepared by arc-melting from pure elements and subsequently annealed. Experimental investigations were focused on magnetization behavior in a wide temperature range from 4 to 1000 K and magnetic field up to 9 T. Optical and magneto-optical (MO) measurements were employed to shed more light on the magnetic state and electronic structure of investigated materials. Magnetization measurements indicated that in the vicinity of stoichiometry (Fe2MnGa) the compounds are ferro/ferrimagnetic, whereas the Fe-deficient compound is paramagnetic and at high Fe concentration the antiferromagnetic interaction prevails. Theoretical calculations of corresponding ordered and disordered stoichiometric compounds were carried out and compared to the experiment on the level of net magnetic moment as well as magneto-optical spectra. This comparison suggests that the Heusler crystal structure, L21, is not present even close to stoichiometry. Moreover, the comparison of density of states (DOS) for ordered and disordered structures allowed us to explain missing martensitic transformation (MT) in investigated materials.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zahradnik2020,
title = {Magnetic domain wall motion in SrRuO3 thin films},
author = {Martin Zahradník and Klára Uhlířová and Thomas Maroutian and Georg Kurij and Guillaume Agnus and Martin Veis and Philippe Lecoeur},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0264127519308287},
doi = {10.1016/j.matdes.2019.108390},
issn = {02641275},
year  = {2020},
date = {2020-02-01},
journal = {Materials & Design},
volume = {187},
pages = {108390},
publisher = {Elsevier Ltd},
abstract = {Influence of substrate miscut on magnetization dynamics in SrRuO3 (SRO) thin films was studied. Two films were grown on SrTiO3 substrates with high (∼ 1°) and low (∼ 0.1°) miscut angles, respectively. As expected, high miscut angle leads to suppression of multi-variant growth. By means of SQUID magnetometry, comparable relaxation effects were observed in both the multi-variant and the nearly single-variant sample. Differences in the magnetization reversal process were revealed by magnetic force microscopy. It showed that the multi-variant growth leads to higher density of defects acting as pinning or nucleation sites for magnetic domains, which consequently results in deterioration of magnetic properties. It was demonstrated that the use of high miscut substrate is important for fabrication of high quality SRO thin films with low density of crystallographic defects and excellent magnetic properties.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Litzius2020,
title = {The role of temperature and drive current in skyrmion dynamics},
author = {Kai Litzius and Jonathan Leliaert and Pedram Bassirian and Davi Rodrigues and Sascha Kromin and Ivan Lemesh and Jakub Zazvorka and Kyu-joon Lee and Jeroen Mulkers and Nico Kerber and Daniel Heinze and Niklas Keil and Robert M Reeve and Markus Weigand and Bartel Van Waeyenberge and Gisela Schütz and Karin Everschor-Sitte and Geoffrey S D Beach and Mathias Kläui},
url = {http://dx.doi.org/10.1038/s41928-019-0359-2%0Ahttp://www.nature.com/articles/s41928-019-0359-2 http://www.nature.com/articles/s41928-019-0359-2},
doi = {10.1038/s41928-019-0359-2},
issn = {2520-1131},
year  = {2020},
date = {2020-01-01},
journal = {Nature Electronics},
volume = {3},
number = {1},
pages = {30--36},
publisher = {Springer US},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Jesenska2019b,
title = {Optical and magneto-optical properties of GdxFe(100-x) thin films close to the compensation point},
author = {Eva Jesenská and Takayuki Ishibashi and Lukáš Beran and Martin Pavelka and Jaroslav Hamrle and Roman Antoš and Jakub Zázvorka and Martin Veis},
url = {http://www.nature.com/articles/s41598-019-52252-z},
doi = {10.1038/s41598-019-52252-z},
issn = {2045-2322},
year  = {2019},
date = {2019-12-01},
journal = {Scientific Reports},
volume = {9},
number = {1},
pages = {16547},
publisher = {Nature Publishing Group},
abstract = {Unlike ferromagnetic materials, ferrimagnetic metals have recently received considerable attention due to their bulk perpendicular magnetic anisotropy, low net magnetization and tunable magnetic properties. This makes them perfect candidates for the research of recently discovered spin-torque related phenomena. Among other ferrimagnetic metals, GdFe has an advantage in relatively large magnetic moments in both sublattices and tunability of compensation point above the room temperature by small changes in its composition. We present a systematic study of optical and magneto-optical properties of amorphous GdxFe(100-x) thin films of various compositions (x = 18.3, 20.0, 24.7, 26.7) prepared by DC sputtering on thermally oxidized SiO2 substrates. A combination of spectroscopic ellipsometry and magneto-optical spectroscopy in the photon energy range from 1.5 to 5.5 eV with advanced theoretical models allowed us to deduce the spectral dependence of complete permittivity tensors across the compensation point. Such information is important for further optical detection of spin related phenomena driven by vicinity of compensation point in nanostructures containing GdFe.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Illa2019,
title = {Structural, magnetic, optical, and magneto-optical properties of CoFe2O4 thin films fabricated by a chemical approach},
author = {Ramakanth Illa and Radek Ješko and Robin Silber and Ondřej Životský and Kateřina Mamulová Kutláková and Lenka Matějová and Marek Kolenčík and Jaromír Pištora and Jaroslav Hamrle},
doi = {10.1016/j.materresbull.2019.05.002},
issn = {00255408},
year  = {2019},
date = {2019-09-01},
journal = {Materials Research Bulletin},
volume = {117},
pages = {96--102},
publisher = {Elsevier Ltd},
abstract = {Homogeneous, smooth, and partially transparent nanocrystalline thin films of CoFe2O4 were fabricated using a chemical solution approach with additional annealing for 2 h in a temperature range of 300 °C to 600 °C. Structural properties investigated by X-ray diffraction showed a single-phase spinel structure with a random crystallographic orientation for samples annealed above 400 °C. The ferromagnetic nature of prepared films was established from combined substrate with film hysteresis loops measured using a vibrating sample magnetometer. Optical and magneto-optical spectroscopic measurements revealed an improvement in the structural quality of the films after annealing up to 600 °C.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zazvorka2019,
title = {Thermal skyrmion diffusion used in a reshuffler device},
author = {Jakub Zázvorka and Florian Jakobs and Daniel Heinze and Niklas Keil and Sascha Kromin and Samridh Jaiswal and Kai Litzius and Gerhard Jakob and Peter Virnau and Daniele Pinna and Karin Everschor-Sitte and Levente Rózsa and Andreas Donges and Ulrich Nowak and Mathias Kläui},
url = {https://doi.org/10.1038/s41565-019-0436-8 http://www.nature.com/articles/s41565-019-0436-8},
doi = {10.1038/s41565-019-0436-8},
issn = {1748-3387},
year  = {2019},
date = {2019-07-01},
journal = {Nature Nanotechnology},
volume = {14},
number = {7},
pages = {658--661},
abstract = {Magnetic skyrmions in thin films can be efficiently displaced with high speed by using spin-transfer torques 1,2 and spin–orbit torques 3–5 at low current densities. Although this favourable combination of properties has raised expectations for using skyrmions in devices 6,7 , only a few publications have studied the thermal effects on the skyrmion dynamics 8–10 . However, thermally induced skyrmion dynamics can be used for applications 11 such as unconventional computing approaches 12 , as they have been predicted to be useful for probabilistic computing devices 13 . In our work, we uncover thermal diffusive skyrmion dynamics by a combined experimental and numerical study. We probed the dynamics of magnetic skyrmions in a specially tailored low-pinning multilayer material. The observed thermally excited skyrmion motion dominates the dynamics. Analysing the diffusion as a function of temperature, we found an exponential dependence, which we confirmed by means of numerical simulations. The diffusion of skyrmions was further used in a signal reshuffling device as part of a skyrmion-based probabilistic computing architecture. Owing to its inherent two-dimensional texture, the observation of a diffusive motion of skyrmions in thin-film systems may also yield insights in soft-matter-like characteristics (for example, studies of fluctuation theorems, thermally induced roughening and so on), which thus makes it highly desirable to realize and study thermal effects in experimentally accessible skyrmion systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zahradnik2019b,
title = {Electronic structure of La2/3Sr1/3MnO3: Interplay of oxygen octahedra rotations and epitaxial strain},
author = {Martin Zahradník and Thomas Maroutian and Martin Zelen{ý} and Lukáš Horák and Georg Kurij and Tomáš Male{č}ek and Lukáš Beran and {Š}tefan Višňovsk{ý} and Guillaume Agnus and Philippe Lecoeur and Martin Veis},
url = {https://link.aps.org/doi/10.1103/PhysRevB.99.195138},
doi = {10.1103/PhysRevB.99.195138},
issn = {24699969},
year  = {2019},
date = {2019-05-01},
journal = {Physical Review B},
volume = {99},
number = {19},
pages = {195138},
abstract = {Influence of epitaxial strain and oxygen octahedra rotations on electronic structure of La2/3Sr1/3MnO3 ultrathin films was systematically studied. The investigated films were grown by pulsed laser deposition on four different substrates: cubic (001)-oriented LaAlO3, (001) (LaAlO3)1/3(Sr2AlTaO6)2/3, (001) SrTiO3, and orthorhombic (110) DyScO3, providing a broad range of induced epitaxial strains. Magnetic properties were found to deteriorate with increasing value of the epitaxial strain, as expected due to unit cell distortion increasingly deviating from the bulk and effect of the magnetically inert layer. A combination of spectroscopic ellipsometry and magneto-optical Kerr effect spectroscopy was used to determine spectra of the diagonal and off-diagonal elements of permittivity tensor. The off-diagonal elements at room temperature confirmed the presence of two previously reported electronic transitions in the spectra of all films. Moreover they revealed another electronic transition around 4.3 eV only in the spectra of films grown under compressive strain. We proposed classification of this transition as a crystal field paramagnetic Mn t2g→eg transition. Ab initio calculations were employed to distinguish between the potential influence of oxygen octahedra rotations and distortions. The ab initio calculations indicated a negligible influence of oxygen octahedra rotations on magneto-optical properties of La2/3Sr1/3MnO3. They further supported the proposed classification of the additional electronic transition, showing a key role of strain in controlling the electronic structure of ultrathin perovskite films.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Cejpek2019b,
title = {Rapid floating zone growth of Ni2MnGa single crystals exhibiting magnetic shape memory functionality},
author = {Petr Cejpek and Ladislav Straka and Martin Veis and Ross Colman and Milan Dopita and Václav Holý and Oleg Heczko},
doi = {10.1016/j.jallcom.2018.10.113},
issn = {09258388},
year  = {2019},
date = {2019-02-01},
journal = {Journal of Alloys and Compounds},
volume = {775},
pages = {533--541},
publisher = {Elsevier Ltd},
abstract = {To obtain a material exhibiting magnetically induced reorientation (MIR), one of the magnetic shape memory effects, a well-developed method for single crystal growth is crucial. A [100] oriented Ni 2 MnGa single crystal exhibiting MIR was successfully prepared using the floating-zone technique with a high speed of 80 mm/h. The comparison with a sample grown by Bridgman method and a reference sample grown in AdaptaMat Ltd. by directional solidification is provided based on elemental homogeneity, crystallographic quality by x-ray diffraction, transformation behaviour and magnetic properties. All these methods indicated that the single crystal grown by floating zone with high speed is comparable or superior to the samples prepared by other methods. Importantly, the magnetization measurement revealed that the single crystal prepared this way exhibits MIR down to 10 K.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Silber2019,
title = {Quadratic magneto-optic Kerr effect spectroscopy of Fe epitaxial films on MgO(001) substrates},
author = {Robin Silber and Ondřej Stejskal and Lukáš Beran and Petr Cejpek and Roman Antoš and Tristan Matalla-Wagner and Jannis Thien and Olga Kuschel and Joachim Wollschläger and Martin Veis and Timo Kuschel and Jaroslav Hamrle},
doi = {10.1103/PhysRevB.100.064403},
year  = {2019},
date = {2019-01-01},
journal = {Physical Review B},
volume = {100},
pages = {64403},
abstract = {The magneto-optic Kerr effect (MOKE) is a well known and handy tool to characterize ferro-, ferri-, and antiferromagnetic materials. Many of the MOKE techniques employ effects solely linear in magnetization M. Nevertheless, a higher-order term being proportional to M 2 and called quadratic MOKE (QMOKE) can additionally contribute to the experimental data. Here, we present detailed QMOKE spectroscopy measurements in the range of 0.8-5.5 eV based on a modified eight-directional method applied on ferromagnetic bcc Fe thin films grown on MgO substrates. From the measured QMOKE spectra, two further complex spectra of the QMOKE parameters G s and 2G 44 are yielded. The difference between those two parameters, known as G, denotes the strength of the QMOKE anisotropy. Those QMOKE parameters give rise to the QMOKE tensor G, fully describing the perturbation of the permittivity tensor in the second order in M for cubic crystal structures. We further present experimental measurements of ellipsometry and linear MOKE spectra, wherefrom permittivity in the zeroth and the first order in M are obtained, respectively. Finally, all those spectra are described by ab initio calculations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Stejskal2018,
title = {Convergence study of the ab-initio calculated quadratic magneto-optical spectra in bcc Fe},
author = {Ondřej Stejskal and Robin Silber and Jaromír Pištora and Jaroslav Hamrle},
url = {https://www.sciencedirect.com/science/article/pii/S1569441017303681?via%3Dihub},
doi = {10.1016/j.photonics.2018.06.006},
issn = {15694410},
year  = {2018},
date = {2018-12-01},
journal = {Photonics and Nanostructures - Fundamentals and Applications},
volume = {32},
pages = {24-27},
publisher = {Elsevier},
abstract = {Using the WIEN2k code, we perform ab-initio calculations of the electronic structure and the permittivity tensor of bcc Fe with magnetization along the [001] and [011] directions. The electronic structure is calculated with various numbers of k-points in the full Brillouin zone and the convergence of the calculated data is being studied. Two exchange-correlation potentials are employed, namely LDA and GGA, and their effect on the outcoming spectra is shown. The permittivity tensor is obtained from the electronic structure by the Kubo formula. From the permittivity tensor the complex spectra of linear (K) and quadratic (Gs, 2G44) magneto-optical parameters are extracted. The spectra are compared to the literature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Rosenberg2018,
title = {Magnetism and spin transport in rare-earth-rich epitaxial terbium and europium iron garnet films},
author = {Ethan R. Rosenberg and Lukáš Beran and Can O. Avci and Cyrus Zeledon and Bingqian Song and Claudio Gonzalez-Fuentes and Johannes Mendil and Pietro Gambardella and Martin Veis and Carlos Garcia and Geoffrey S. D. Beach and Caroline A. Ross},
url = {https://link.aps.org/doi/10.1103/PhysRevMaterials.2.094405},
doi = {10.1103/PhysRevMaterials.2.094405},
issn = {2475-9953},
year  = {2018},
date = {2018-09-14},
journal = {Physical Review Materials},
volume = {2},
number = {9},
pages = {094405},
publisher = {American Physical Society},
abstract = {Rare-earth iron garnet thin films with perpendicular magnetic anisotropy (PMA) have recently attracted a great deal of attention for spintronic applications. Thulium iron garnet (TmIG) has been successfully grown and TmIG/Pt heterostructures have been characterized. However, TmIG is not the only rare-earth iron garnet that can be grown with PMA. We report the growth, magnetic, and spintronic properties of epitaxial terbium iron garnet (TbIG) and europium iron garnet (EuIG) thin films with PMA. Reciprocal space mapping shows the films are lattice matched to the substrate without strain relaxation, even for films up to 56 nm thick. The lattice strain and magnetostriction coefficient produce PMA in certain cases. TbIG grows on (111) gadolinium gallium garnet (GGG) with PMA due to the in-plane compressive strain, whereas TbIG on (111) substituted GGG (SGGG) is in tension and has an in-plane easy axis. EuIG grows with PMA on (100) and (111) GGG substrates, which facilitates the investigation of spintronic properties as a function of orientation. Both garnets have excess rare earth, which is believed to occupy Fe octahedral sites and in the case of TbIG is associated with an increase in the compensation temperature to 330 K, higher than the bulk value. Anomalous Hall effect (AHE) measurements of Pt/EuIG Hall crosses show that the spin mixing conductance of Pt/ (111) and (100) EuIG is similar. AHE measurements of Pt/TbIG Hall crosses reveal a sign change in the AHE amplitude at the compensation point analogous to all-metallic systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Silber2018,
title = {Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation},
author = {Robin Silber and Michaela Tomíčková and Jari Rodewald and Joachim Wollschläger and Jaromír Pištora and Martin Veis and Timo Kuschel and Jaroslav Hamrle},
url = {https://www.sciencedirect.com/science/article/pii/S1569441017303693},
doi = {10.1016/j.photonics.2018.05.007},
issn = {15694410},
year  = {2018},
date = {2018-09-01},
journal = {Photonics and Nanostructures - Fundamentals and Applications},
volume = {31},
pages = {60--65},
publisher = {Elsevier},
abstract = {In most of the cases the magnetooptic Kerr effect (MOKE) techniques rely solely on the effects linear in magnetization (M). Nevertheless, a higher-order term being proportional to M2 and called quadratic MOKE (QMOKE) can additionally contribute to experimental data. Handling and understanding the underlying origin of QMOKE could be the key to utilize this effect for investigation of antiferromagnetic materials in the future due to their vanishing first order MOKE contribution. Also, better understanding of QMOKE and hence better understanding of magnetooptic (MO) effects in general is very valuable, as the MO effect is very much employed in research of ferro- and ferrimagnetic materials. Therefore, we present our QMOKE and longitudinal MOKE spectroscopy setup with a spectral range of 0.8–5.5 eV. The setup is based on light modulation through a photoelastic modulator and detection of second-harmonic intensity by a lock-in amplifier. To measure the Kerr ellipticity an achromatic compensator is used within the setup, whereas without it Kerr rotation is measured. The separation of QMOKE spectra directly from the measured data is based on measurements with multiple magnetization directions. So far the QMOKE separation algorithm is developed and tested for but not limited to cubic (001) oriented samples. The QMOKE spectra yielded by our setup arise from two quadratic MO parameters Gs and 2G44, being elements of quadratic MO tensor G, which describes perturbation of the permittivity tensor in the second order in M.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Veis2018,
title = {Band structure of CuMnAs probed by optical and photoemission spectroscopy},
author = {Martin Veis and J. Minár and G. Steciuk and L. Palatinus and C. Rinaldi and M. Cantoni and D. Kriegner and K. K. Tikuišis and Jaroslav Hamrle and Martin Zahradník and Roman Antoš and J. Železný and L. Šmejkal and X. Marti and P. Wadley and R. P. Campion and C. Frontera and K. Uhlířová and T. Duchoň and P. Kužel and V. Novák and T. Jungwirth and K. Výborný},
url = {https://link.aps.org/doi/10.1103/PhysRevB.97.125109},
doi = {10.1103/PhysRevB.97.125109},
issn = {2469-9950},
year  = {2018},
date = {2018-03-08},
journal = {Physical Review B},
volume = {97},
number = {12},
pages = {125109},
publisher = {American Physical Society},
abstract = {The tetragonal phase of CuMnAs progressively appears as one of the key materials for antiferromagnetic spintronics due to efficient current-induced spin-torques whose existence can be directly inferred from crystal symmetry. Theoretical understanding of spintronic phenomena in this material, however, relies on the detailed knowledge of electronic structure (band structure and corresponding wave functions) which has so far been tested only to a limited extent. We show that AC permittivity (obtained from ellipsometry) and UV photoelectron spectra agree with density functional calculations. Together with the x-ray diffraction and precession electron diffraction tomography, our analysis confirms recent theoretical claim [Phys. Rev. B 96, 094406 (2017)] that copper atoms occupy lattice positions in the basal plane of the tetragonal unit cell.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Subr2017,
title = {Anisotropic Optical Response of Silver Nanorod Arrays: Surface Enhanced Raman Scattering Polarization and Angular Dependences Confronted with Ellipsometric Parameters},
author = {Martin Šubr and Martin Petr and Ondřej Kylián and Josef Štěpánek and Martin Veis and Marek Procházka},
url = {http://www.nature.com/articles/s41598-017-04565-0},
doi = {10.1038/s41598-017-04565-0},
issn = {2045-2322},
year  = {2017},
date = {2017-12-01},
journal = {Scientific Reports},
volume = {7},
number = {1},
pages = {4293},
publisher = {Nature Publishing Group},
abstract = {Silver nanorod arrays prepared by oblique angle deposition (AgOADs) represent versatile, simple and inexpensive substrates for high sensitivity surface enhanced Raman scattering (SERS) applications. Their anisotropic nature suggests that their optical responses such as the SERS signal, the depolarization ratio, reflectivity and ellipsometric parameters critically depend on the states of polarization, nanorod angular arrangement and specific illumination-observation geometry. SERS polarization and angular dependences of AgOADs were measured using methylene blue (MB) molecule. Our study constitutes, to our knowledge, the most detailed investigation of such characteristics of plasmonic nanostructures to date. This is due to the 90°-scattering geometry used in which two out of three Euler angles determining the nanorod spatial orientation and four polarization combinations can be varied simultaneously. We attributed the anisotropic optical response to anisotropic (pseudo)refractive index caused by different periodicity of our structures in different directions since the plasmonic properties were found rather isotropic. For the first time we demonstrate very good correspondence between SERS intensities and ellipsometric parameters for all measured configurations as compared on the basis of the surface selection rules. Obtained results enable quantitative analysis of MB Raman tensor elements, indicating that the molecules adsorb predominantly with the symmetry axis perpendicular to the surface.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Antos2017,
title = {Fourier factorization in the constitutive relations for modeling diffraction gratings with continuous permittivity profiles},
author = {Roman Antoš and Martin Veis},
url = {https://www.osapublishing.org/abstract.cfm?URI=oe-25-20-24370},
doi = {10.1364/OE.25.024370},
issn = {1094-4087},
year  = {2017},
date = {2017-10-01},
journal = {Optics Express},
volume = {25},
number = {20},
pages = {24370},
publisher = {Optical Society of America},
abstract = {The validity of the Fourier factorization (FF) rules used in the constitutive relations in the Fourier modal method is analyzed for one-dimensional diffraction gratings made as a thin film with uniform thickness and several examples of continuous lateral profiles of permittivity. The comparison of the method using the correct FF rules with other FF choices demonstrates the validity of the FF rules for any inhomogeneous, not only discontinuous profile.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Avci2017,
title = {Fast switching and signature of efficient domain wall motion driven by spin-orbit torques in a perpendicular anisotropy magnetic insulator/Pt bilayer},
author = {Can Onur Avci and Ethan Rosenberg and Manuel Baumgartner and Lukáš Beran and Andy Quindeau and Pietro Gambardella and Caroline A. Ross and Geoffrey S. D. Beach},
url = {http://aip.scitation.org/doi/10.1063/1.4994050},
doi = {10.1063/1.4994050},
issn = {0003-6951},
year  = {2017},
date = {2017-08-01},
journal = {Applied Physics Letters},
volume = {111},
number = {7},
pages = {072406},
publisher = {AIP Publishing LLC},
abstract = {We report fast and efficient current-induced switching of a perpendicular anisotropy magnetic insulator thulium iron garnet by using spin-orbit torques (SOT) from the Pt overlayer. We first show that, with quasi-DC (10 ms) current pulses, SOT-induced switching can be achieved with an external field as low as 2 Oe, making TmIG an outstanding candidate to realize efficient switching in heterostructures that produce moderate stray fields without requiring an external field. We then demonstrate deterministic switching with fast current pulses (≤20 ns) with an amplitude of ∼1012 A/m2, similar to all-metallic structures. We reveal that, in the presence of an initially nucleated domain, the critical switching current is reduced by up to a factor of five with respect to the fully saturated initial state, implying efficient current-driven domain wall motion in this system. Based on measurements with 2 ns-long pulses, we estimate the domain wall velocity of the order of ∼400 m/s per j = 1012 A/m2.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Heczko2017,
title = {Using Kerr Microscopy for Direct Observation of Magnetic Domains in Ni–Mn–Ga Magnetic Shape Memory Alloy},
author = {Oleg Heczko and Oleksiy Perevertov and Daniel Král and Martin Veis and Ivan V. Soldatov and Rudolf Schafer},
url = {http://ieeexplore.ieee.org/document/7932970/},
doi = {10.1109/TMAG.2017.2707486},
issn = {0018-9464},
year  = {2017},
date = {2017-05-23},
journal = {IEEE Transactions on Magnetics},
volume = {53},
number = {11},
pages = {1-5},
abstract = {The magnetic domains in a magnetic shape-memory Ni-Mn-Ga alloy were observed by magneto-optical Kerr microscopy using monochromatic blue LED light. The domains were observed for both single- and multivariant ferroelastic states of modulated martensite. The multivariant state with very fine twins was spontaneously formed after transformation from high-temperature austenite. For both cases, bar domains separated by 180° domain walls were found and their dynamics was studied. A quasidomain model was applied to explain the domains in the multivariant state.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Zhang2017a,
title = {Enhanced magneto-optical effect in Y1.5Ce1.5Fe5O12thin films deposited on silicon by pulsed laser deposition},
author = {Y Zhang and C T Wang and X Liang and B Peng and H P Lu and P H Zhou and L Zhang and J X Xie and L J Deng and Martin Zahradnik and Lukáš Beran and Miroslav Kucera and Martin Veis and Caroline A. Ross and L Bi},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0925838817303948?via%3Dihub https://linkinghub.elsevier.com/retrieve/pii/S0925838817303948},
doi = {10.1016/j.jallcom.2017.01.315},
issn = {09258388},
year  = {2017},
date = {2017-05-01},
journal = {Journal of Alloys and Compounds},
volume = {703},
pages = {591-599},
publisher = {Elsevier},
abstract = {Polycrystalline Ce:YIG thin films deposited on silicon are promising material candidates for integrated nonreciprocal photonic devices. So far, the reported Faraday rotation of polycrystalline Ce:YIG thin films on silicon is much lower than that of their single crystal or epitaxial thin film counterparts, limiting the magneto-optical figure of merit, device bandwidth and fabrication tolerance. In this paper, we report the growth of Ce:YIG thin films on silicon from targets with high Ce concentration up to nominally Y1.5Ce1.5Fe5O12by pulsed laser deposition. The polycrystalline Y1.5Ce1.5Fe5O12thin film showed pure garnet phase, smooth surface roughness of 0.7 nm, a dominant Ce3+valence state and a bulk-like saturation magnetization of 125 emu/cm3at room temperature. This material shows high Faraday rotation of −6410 deg/cm at 1550 nm wavelength, exceeding that of an Y2Ce1Fe5O12epitaxial thin film on a GGG (100) substrate. However higher loss and lower figure of merit is also observed at 1550 nm wavelength compared to Y2Ce1Fe5O12thin films, possibly due to the low oxygen partial pressure during fabrication. Low deposition oxygen partial pressure is essential to enhance the Ce solubility and Ce3+concentration, which results in large Faraday rotation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Lage2017,
title = {Temperature-dependent faraday rotation and magnetization reorientation in cerium-substituted yttrium iron garnet thin films},
author = {Enno Lage and Lukáš Beran and Andy Udo Quindeau and Lukáš Ohnoutek and Miroslav Kucera and Roman Antos and Sohrab Redjai Sani and Gerald F. Dionne and Martin Veis and Caroline A. Ross},
url = {http://aip.scitation.org/doi/10.1063/1.4976817},
doi = {10.1063/1.4976817},
issn = {2166532X},
year  = {2017},
date = {2017-03-01},
journal = {APL Materials},
volume = {5},
number = {3},
pages = {036104},
publisher = {AIP Publishing LLC},
abstract = {We report on the temperature dependence of the magnetic and magneto-optical properties in cerium-substituted yttrium iron garnet (Ce: YIG) thin films. Measurements of the Faraday rotation as a function of temperature show that the magnetic easy axis of thin Ce: YIG films reorients from in-plane to out-of-plane on cooling below -100 °C. We argue that the temperature-dependence of the magnetostriction and magnetocrystalline anisotropy of Ce: YIG is the dominant factor contributing to the change in easy axis direction, and we describe the changes in the magneto-optical spectra with temperature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Hakl2017,
title = {The saturation of interband Faraday rotation in Bi2Se3},
author = {Michael Hakl and Lukáš Ohnoutek and Martin Veis and Č. Drašar and A. Materna and G. Strzelecka and A. Hruban and A. Slobodeniuk and B. A. Piot and G. Martinez and M. Potemski and Milan Orlita},
url = {http://stacks.iop.org/0295-5075/117/i=4/a=47006?key=crossref.7640cd5ae6a32dab0619585882db41b0},
doi = {10.1209/0295-5075/117/47006},
issn = {12864854},
year  = {2017},
date = {2017-02-01},
journal = {EPL},
volume = {117},
number = {4},
pages = {47006},
publisher = {IOP Publishing},
abstract = {Bismuth selenide - the prominent topological insulator - has been recently reported as a material exhibiting an extraordinary strong Faraday rotation. This effect has been identified as due to interband excitations in bulk promoting electrons from the valence to the conduction band, in which the electron gas is partially spin-polarized due to the Zeeman effect. In this work, we test the Faraday rotation in Bi 2 Se 3 in high magnetic fields, when the conduction band electrons reach their full spin polarization. We find that the Faraday angle becomes in this regime almost independent of the applied magnetic field. This contrasts with the Faraday effect observed in this system at low magnetic fields, where the Faraday angle scales linearly with B and may thus be described by a conventional Verdet law.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Tikuisis2017,
title = {Optical and Magneto-optical Properties of Permalloy Thin Films in 0.7–6.4 eV Photon Energy Range},
author = {Kristupas Kazimieras Tikuišis and Lukáš Beran and Petr Cejpek and Klára Uhlířová and Jaroslav Hamrle and Marek Vaňatka and Michal Urbánek and Martin Veis},
url = {https://www.sciencedirect.com/science/article/pii/S0264127516313351 https://linkinghub.elsevier.com/retrieve/pii/S0264127516313351},
doi = {10.1016/j.matdes.2016.10.036},
issn = {02641275},
year  = {2017},
date = {2017-01-15},
journal = {Materials & Design},
volume = {114},
pages = {31--39},
publisher = {Elsevier},
abstract = {Permalloy is a widespread material used in numerous fundamental experiments and novel spintronic, optoelectronic devices. In order to model their response or tailor the optimal experimental parameters it is necessary to know the optical and magneto-optical properties of this material over a wide spectral range. We report on the systematic study of optical and magneto-optical properties of 10 nm and 150 nm thick permalloy films by means of spectroscopic ellipsometry and magneto-optical spectroscopy. To study the influence of the surface oxidization, the samples were prepared with and without Au capping layer. Spectral dependence of the complete permittivity tensor was derived from experimental data in a broad spectral range covering IR, visible and UV regions. All samples exhibited metallic-like optical and magneto-optical properties with clear differences in 10 nm thick bare sample. These differences to overall optical and magneto-optical properties of nanometer-thick permalloy layers were ascribed to a strong influence of the surface oxide.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Hamrlova2016a,
title = {Principal spectra describing magnetooptic permittivity tensor in cubic crystals},
author = {Jana Hamrlová and Dominik Legut and Martin Veis and Jaromír Pištora and Jaroslav Hamrle},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0304885316314275 https://linkinghub.elsevier.com/retrieve/pii/S0304885316314275},
doi = {10.1016/j.jmmm.2016.07.020},
issn = {03048853},
year  = {2016},
date = {2016-12-15},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {420},
pages = {143-151},
publisher = {North-Holland},
abstract = {We provide unified phenomenological description of magnetooptic effects being linear and quadratic in magnetization. The description is based on few principal spectra, describing elements of permittivity tensor up to the second order in magnetization. Each permittivity tensor element for any magnetization direction and any sample surface orientation is simply determined by weighted summation of the principal spectra, where weights are given by crystallographic and magnetization orientations. The number of principal spectra depends on the symmetry of the crystal. In cubic crystals owning point symmetry we need only four principal spectra. Here, the principal spectra are expressed by ab initio calculations for bcc Fe, fcc Co and fcc Ni in optical range as well as in hard and soft x-ray energy range, i.e. at the 2p- and 3p-edges. We also express principal spectra analytically using modified Kubo formula.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Saidl2016,
title = {Investigation of magneto-structural phase transition in FeRh by reflectivity and transmittance measurements in visible and near-infrared spectral region},
author = {Vít Saidl and Martin Brajer and Lukáš Horák and Helena Reichlová and Karel Výborný and Martin Veis and Tomáš Janda and FrantišekTrojánek and Miroslav Maryško and I Fina and X Marti and Tomáš Jungwirth and Petr Němec},
url = {https://doi.org/10.1088%2F1367-2630%2F18%2F8%2F083017},
doi = {10.1088/1367-2630/18/8/083017},
year  = {2016},
date = {2016-08-03},
journal = {New Journal of Physics},
volume = {18},
number = {8},
pages = {083017},
publisher = {IOP Publishing},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Wada2016b,
title = {Aperture-ratio dependence of the efficiency of magneto-optical first-order diffraction in GdFe stripe arrays with alternating perpendicular magnetization},
author = {Kakeru Wada and Roman Antos and Ken-ichi Aoshima and Kenji Machida and Kiyoshi Kuga and Hiroshi Ono and Hiroshi Kikuchi and Naoki Shimidzu and Takayuki Ishibashi},
url = {http://www.sciencedirect.com/science/article/pii/S0030401816302000},
doi = {https://doi.org/10.1016/j.optcom.2016.03.037},
issn = {0030-4018},
year  = {2016},
date = {2016-07-15},
journal = {Optics Communications},
volume = {371},
pages = {67 - 71},
abstract = {The efficiency of magneto-optical (MO) diffraction in GdFe stripe arrays with alternating directions of perpendicular magnetization is investigated. The diffraction efficiency depends on the aperture ratio, as theoretically analyzed for an array composed of magnetic and nonmagnetic materials, with the magnetization directions parallel or antiparallel. The stripe patterns are composed of two ferromagnetic alloys of different compositions, Gd19.7Fe80.3 and Gd23.4Fe76.6 (denoted GF1 and GF2), having different coercivities in the parallel and antiparallel configurations. The stripe patterns are separated by nonmagnetic SiO2 stripes of different widths to obtain aperture ratios of 100, 75, 50 and 25%. The magnetization distributions in the samples is confirmed by MO microscopy. The diffraction efficiencies at a wavelength of 532nm are measured to be 1.27×10–6, 1.04×10–6, 6.2×10–7 and 2.0×10–7 for aperture ratios of 100, 75, 50, and 25%, respectively. Those values are in accord with calculations using the measured MO and optical parameters of the GF1 layer, including the Kerr rotation angle of 0.12°, the Kerr ellipticity of −0.1° and the reflectance of 0.37.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Jesenska2016b,
title = {Optical and magneto-optical properties of Bi substituted yttrium iron garnets prepared by metal organic decomposition},
author = {Eva Jesenska and Tomohiko Yoshida and Kenji Shinozaki and Takayuki Ishibashi and Lukas Beran and Martin Zahradnik and Roman Antos and Miroslav Ku{č}era and Martin Veis},
url = {https://www.osapublishing.org/abstract.cfm?URI=ome-6-6-1986},
doi = {10.1364/OME.6.001986},
issn = {2159-3930},
year  = {2016},
date = {2016-06-01},
journal = {Optical Materials Express},
volume = {6},
number = {6},
pages = {1986},
publisher = {Optical Society of America},
abstract = {In this work, we present a systematic study of optical and magneto-optical properties of Y3-xBixFe5O12 thin films with various Bi concentrations (x = 1.5, 2, 2.5, 3) prepared by Metal Organic Decomposition on Gd3Ga5O12 (100) substrates. We used magneto-optical spectroscopy and spectroscopic ellipsometry. Spectral dependence of complex refraction indexes obtained from ellipsometric measurements revealed increasing optical absorption with increasing Bi concentrations. Faraday and Kerr magneto-optical spectra measured in the photon energy range from 1.5 to 5.5 eV clearly demonstrated that the increasing Bi concentration enhances the spin-orbit coupling and influences the magnetooptical effect. Using the magneto-optical and ellipsometric experimental data we deduced a spectral dependence of complete permittivity tensor in a wide spectral range. Comparison of obtained results with the results reported on Liquid Phase Epitaxy bulk-like garnets with small Bi concentrations showed agreement and confirmed a high optical and magneto-optical quality of investigated films.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Onbasli2016a,
title = {Optical and magneto-optical behavior of Cerium Yttrium Iron Garnet thin films at wavelengths of 200–1770 nm},
author = {Mehmet C. Onbasli and Lukáš Beran and Martin Zahradník and Miroslav Kučera and Roman Antoš and Jan Mistrík and Gerald F. Dionne and Martin Veis and Caroline A. Ross},
url = {http://www.nature.com/articles/srep23640},
doi = {10.1038/srep23640},
issn = {2045-2322},
year  = {2016},
date = {2016-03-30},
journal = {Scientific Reports},
volume = {6},
number = {1},
pages = {23640},
publisher = {Nature Publishing Group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Ohnoutek2016b,
title = {Strong interband Faraday rotation in 3D topological insulator Bi2Se3},
author = {Lukáš Ohnoutek and Michael Hakl and Martin Veis and B. A. Piot and C. Faugeras and G. Martinez and M. V. Yakushev and R. W. Martin and Č. Drašar and A. Materna and G. Strzelecka and A. Hruban and M Potemski and Milan Orlita},
url = {http://www.nature.com/articles/srep19087},
doi = {10.1038/srep19087},
issn = {2045-2322},
year  = {2016},
date = {2016-01-11},
journal = {Scientific Reports},
volume = {6},
number = {1},
pages = {19087},
publisher = {Nature Publishing Group},
abstract = {The Faraday effect is a representative magneto-optical phenomenon, resulting from the transfer of angular momentum between interacting light and matter in which time-reversal symmetry has been broken by an externally applied magnetic field. Here we report on the Faraday rotation induced in the prominent 3D topological insulator Bi2Se3 due to bulk interband excitations. The origin of this non-resonant effect, extraordinarily strong among other non-magnetic materials, is traced back to the specific Dirac-type Hamiltonian for Bi2Se3, which implies that electrons and holes in this material closely resemble relativistic particles with a non-zero rest mass.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Jesenska2016c,
title = {Optical and Magneto-Optical Properties of Gd22Fe78 Thin Films in the Photon Energy Range From 1.5 to 5.5 eV},
author = {Eva Jesenská and Takahiro Hashinaka and Takayuki Ishibashi and Lukáš Beran and Ján Dušek and Roman Antoš and Kiyoshi Kuga and Ken-ichi Aoshima and Kenji Machida and Hidekazu Kinjo and Martin Veis},
url = {http://www.mdpi.com/1996-1944/9/1/23},
doi = {10.3390/ma9010023},
issn = {1996-1944},
year  = {2016},
date = {2016-01-02},
journal = {Materials},
volume = {9},
number = {1},
pages = {23},
publisher = {Multidisciplinary Digital Publishing Institute},
abstract = {Optical and magneto-optical properties of amorphous Gd22Fe78 (GdFe) thin films prepared by direct current (DC) sputtering on thermally oxidized substrates were characterized by the combination of spectroscopic ellipsometry and magneto-optical spectroscopy in the photon energy range from 1.5 to 5.5 eV. Thin SiNx and Ru coatings were used to prevent the GdFe surface oxidation and contamination. Using advanced theoretical models spectral dependence of the complete permittivity tensor and spectral dependence of the absorption coefficient were deduced from experimental data. No significant changes in the optical properties upon different coatings were observed, indicating reliability of used analysis.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}