Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.17: Poster

Donnerstag, 20. März 2025, 15:00–17:30, P3

Modeling the magneto-optical Kerr effect in three-dimensional magnetic microstructures — •Florian Ott, Christian Janzen, Bhavadip Rakholiya, Rico Huhnstock, and Arno Ehresmann — Institute of Physics, University of Kassel, Germany

Topographically-elevated magnetic microstructures with complex three-dimensional geometries are promising for the discovery and study of novel magnetic effects [1]. These microstructures can in principle be magnetically characterized using MOKE-based measurement devices intended for conventional planar material systems, like for instance a Kerr microscope [2]. However, the interpretation of data is not trivial, because the MOKE depends on the local reflection geometry [3]. Theortical calculations have been performed to characterize MOKE in magnetic multilayer systems with arbitrary surface normals. Further, simulations of simple optical setups have been performed to investigate the effects of the associated surface tilt on the optical path of light in the system. It has been found that additional contributions to the change in polarization of light are obtained by considering the image forming optics of the measurement device.

[1] Streubel, R., Tsymbal, E. Y., et. al. J. Appl. Phys, 129, 210902. (2021); [2] Janzen, C., Rakholiya, B. B., et. al. "Advancing Kerr-Microscopy Imaging of Three-Dimensional Magnetic Structures", INTERMAG Short papers, Rio de Janeiro, Brazil, pp. 1-2. (2024); [3] Soldatov, I., Kolesnikova, V., et. al. IEEE Magnetics Letters, 12, pp. 1-4 (2021)

Keywords: MOKE; Kerr microscope; three-dimensional microstructures; optical simulations