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MA: Fachverband Magnetismus
MA 24: Magnetic Heusler Compounds
MA 24.1: Vortrag
Dienstag, 17. März 2020, 09:30–09:45, HSZ 403
Quadratic magnetooptic Kerr effect spectroscopy on partially ordered Co2MnSi Heusler compounds — •Robin Silber1, Daniel Král2, Ondřej Stejskal2, Lukáš Beran2, Jaromír Pištora1, Martin Veis2, Timo Kuschel3, 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 [2,3] 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 have resonance (sharp peak-like) 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) [4], 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.
[1] O. Gaier et al., J. Appl. Phys. 103, 103910 (2008)
[2] R. Silber et al., Phot. Nano. Fund. Appl. 31, 60 (2018)
[3] R. Silber et al., Phys. Rev. B 100, 064403 (2019)
[4] G. Wolf et al., J. Appl. Phys. 110, 043904 (2011)