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SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.30: Poster

Thursday, September 30, 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 Hamrle21IT4Innovations,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 300C to 500C. 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)

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