Comparative determination of atomic boron and carrier concentration in highly boron doped nano-crystalline diamond

We have compared the total boron content and hole carrier concentration values obtained from various destructive and non-destructive quantification methods in boron doped nano-crystalline diamond films prepared over a range of doping levels, using microwave plasma enhanced chemical vapour deposition.

Our main contribution lies in the optical characterization of these boron-doped diamond (BDD) layers using the non-destructive method of spectroscopic ellipsometry and the influence of the model used on the resulting hole carrier concentration. These results were compared with other methods to estimate Boron content, such as destructive secondary-ion mass spectrometry, glow discharge optical emission spectrometry or non-destructive Raman and van der Pauw Hall measurements. Finally, measured values were compared and discussed regarding their viability for estimation of total boron and electrically active boron in doped nano-crystalline diamond layers.

More in the article here.

Successful Master thesis defence

We are proudly announcing, that summer 2022 two of our students have successfully finished their Master degree. Tomáš Maleček has successfully defended his thesis ‘Substrate controlled physical properties of magnetic oxides thin films for spintronic applications’ and Michal Vančík ‘Physical properties of doped and non-doped Tb3Fe5O12 studied by optical spectroscopies’. They are continuing to pursue scientific career in our department.

Congratulations to both of them.

Succesful bachelor student

We proudly announce that our student Beáta Plaskurová has successfully finished her bachelor studies. She is moving on to study quantum optics further in her Master study, at different department of our university.

Congratulations and we wish her best of luck.

Recent publications 2021

We have several new publications to announce:

In cooperation with JGU Mainz, we observed anisotropic diffusion of skyrmions.

Nico Kerber, Markus Weißenhofer, Klaus Raab, Kai Litzius, Jakub Zázvorka, Ulrich Nowak, Mathias Kläui: Anisotropic Skyrmion Diffusion Controlled by Magnetic-Field-Induced Symmetry Breaking. In: Physical Review Applied, vol. 15, no. 4, pp. 44029, 2021, ISSN: 23317019.

Multilayers of ultrathin cobalt with various capping were investigated upon irradiation with galium ionts

P Mazalski, L Ohnoutek, I Sveklo, L Beran, Z Kurant, W Powroźnik, A Wawro, M O Liedke, M Butterling, A Wagner, J Fassbender, J Hamrle, R Antoš, V Kletecka, M Veis, A Maziewski: Ultrathin Co films with Pt and Au covers - Magnetic and structural properties driven by Ga+ion irradiation. In: New Journal of Physics, vol. 23, no. 2, pp. 023015, 2021, ISSN: 13672630.

We present optical characterization of Y and Lu garnets in single crystals.

J Hrabovský, M Kučera, L Paloušová, L Bi, M Veis: Optical characterization of Y3Al5O12 and Lu3Al5O12 single crystals. In: Optical Materials Express, vol. 11, no. 4, pp. 1218, 2021, ISSN: 2159-3930.

For others, check our Publication page.

Radek Ješko, Ondřej Stejskal, Robin Silber, Lukáš Beran, Martin Veis, Ahmad Omar, Jaroslav Hamrle: Spectral permittivity tensor and density functional theory calculations on the Heusler compound Co2FeAl0.5Si0.5. In: Physical Review B, vol. 103, no. 7, pp. 75146, 2021, ISSN: 24699969.

M Kratochvílová, M Klicpera, F Malý, J Valenta, M Veis, R H Colman, O Heczko: Systematic experimental search for Fe2YZ Heusler compounds predicted by ab-initio calculation. In: Intermetallics, vol. 131, pp. 107073, 2021, ISSN: 09669795.

Kristupas Kazimieras Tikuišis, Jan Wyzula, Lukáš Ohnoutek, Petr Cejpek, Klára Uhlířová, Michael Hakl, Clément Faugeras, Karel Výborný, Akihiro Ishida, Martin Veis, Milan Orlita: Landau level spectroscopy of the PbSnSe topological crystalline insulator. In: Physical Review B, vol. 103, no. 15, pp. 155304, 2021, ISSN: 2469-9950.