Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Focus Session: Magneto-Transport and Magneto-Optics of Higher Orders in Magnetization I
Mittwoch, 19. März 2025, 09:30–13:00, H20
Magneto-transport and magneto-optic effects linear in the magnetization M (e.g. anomalous Hall effect (AHE), Faraday effect or magneto-optic Kerr effect (MOKE)) are important magnetic phenomena in spintronics and magneto-optics for the characterization of magnetic samples by vectorial magnetometry, microscopy, spectroscopy and pump probe experiments. However, already some time ago, it has been shown that the angular dependence of the anisotropic magnetoresistance and of magneto-optic effects contains higher-order-in-M terms. In the last decade, these effects beyond the linear dependence on M, e.g. quadratic effects proportional to M2, have been mainly utilized to investigate antiferromagnetic materials.
Recently, the third-order MOKE proportional to M3, so-called cubic MOKE, was reported to be sensitive to the structural domain twinning in thin-film samples of (111) orientation. By investigating AHE and MOKE of higher orders in M, the multipolar structure of the Berry curvature in magnetization space can be probed. These additional higher-order contributions in standard Hall or polar MOKE setup geometries are able to trace the in-plane magnetization while the linear effect keeps sensitive to the out-of-plane magnetic moment. This can be utilized, for example, to detect spin-orbit torques magneto-optically.
This Focus Session introduces the main magneto-transport and magneto-optic effects of higher orders in magnetization, draws connections between both research fields, distinguishes between already known and new higher-order effects and presents first applications beyond the study of antiferromagnets by quadratic effects.
Coordinators: Timo Kuschel, Bielefeld University, tkuschel@physik.uni-bielefeld.de;
Jaroslav Hamrle, Charles University, Prague, jaroslav.hamrle@matfyz.cuni.cz
