SKM 2021 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.30: Poster

Donnerstag, 30. September 2021, 13:30–16:30, P

Quadratic magnetooptic Kerr effect spectroscopy on partially ordered Co₂MnSi Heusler compounds — •Robin Silber¹, Daniel Král², Ondřej Stejskal², Lukáš Beran¹, Jaromír Pištora², Martin Veis³, Timo Kuschel², and Jaroslav Hamrle² — ¹IT4Innovations,VŠB - Technical University of Ostrava, Czech Republic — ²Charles University, Prague, Czech Republic — ³Bielefeld University, Germany

The Heusler compound Co₂MnSi provides a crystallographic transition from B2 to L2₁ structure with increasing annealing temperature [1]. Here, we present linear and quadratic magnetooptic Kerr effect (LinMOKE and QMOKE) spectroscopy [2] for a set of Co₂MnSi thin-film samples annealed from 300^∘C to 500^∘C. Two interesting features were observed: (i) For photon energy below 3.0 eV, the shape of QMOKE spectra has resonance features, an unusual behaviour for metallic systems. (ii) The amplitude of these peaks is proportional to the annealing temperature and thus, to the amount of L2₁ ordering. While this dependence has been shown for a single wavelength before (1.95 eV) [3], we present this proportionality for the whole studied spectral range. The L2₁ ordering affects the interband contributions of the LinMOKE and QMOKE spectra, which are compared to ab-initio calculations [4].
[1] O. Gaier et al., J. Appl. Phys. 103, 103910 (2008)
[2] R. Silber et al., Phys. Rev. B 100, 064403 (2019)
[3] G. Wolf et al., J. Appl. Phys. 110, 043904 (2011)
[4] R. Silber et al., Appl. Phys. Lett. 116, 262401 (2020)