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MA: Fachverband Magnetismus
MA 39: Poster Magnetism II
MA 39.6: Poster
Mittwoch, 11. März 2026, 18:00–21:00, P2
Ab-initio calculated linear, quadratic and cubic magneto-optic Kerr effect spectra — •Martin Zeman1, Maik Gaerner2, Robin Silber3, Martin Veis1, Timo Kuschel2,4, and Jaroslav Hamrle1,5 — 1Charles University Prague, Czech Republic — 2Bielefeld University, Germany — 3VSB - Technical University of Ostrava, Czech Republic — 4Johannes Gutenberg University Mainz, Germany — 5Czech Technical University, Prague, Czech Republic
The cubic magneto-optic Kerr effect originates from higher-order symmetry terms in cubic crystals. Using density-functional theory within WIEN2k, we calculate the linear, quadratic, and cubic MOKE contributions. First, the permittivity tensor is calculated for different magnetization orientations using the Kubo formula (linear response theory). Then, the individual contributions are separated using expected dependence on the magnetization direction, as predicted by the symmetry. Here we limit to ferromagnetic materials of cubic symmetry, bcc Fe, fcc Co, fcc Ni, and Heusler compounds Co2FeSi and AuMnSb, whose magneto-optic response is described by principal spectra K, Gs, 2G44, and Δ H. Surprisingly, the strength of the cubic contribution Δ H is of similar order as the quadratic ones Gs, 2G44, which has also been confirmed by experimentally [1,2].
[1] M. Gaerner et al., Phys. Rev. Appl. 22, 024066 (2024)
[2] R. Silber et al, Phys. Rev. B 100, 064403 (2019)
Keywords: Magneto-optic Kerr effect; Density functional theory; Spin-orbit coupling; Higher order effects in magnetization