Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Magnetic Imaging and Sensors II
MA 25.4: Vortrag
Mittwoch, 20. März 2024, 10:15–10:30, EB 301
Third-order magnetooptic Kerr effect in magnetic thin films — Maik Gaerner1, Robin Silber2, Jaroslav Hamrle3, and •Timo Kuschel1 — 1Bielefeld University, Germany — 2Technical University of Ostrava, Czechia — 3Charles University, Prague, Czechia
The magnetooptic Kerr effect (MOKE) describes the change of polarization when linear polarized light is reflected from a magnetized sample. This enables to study the reversal processes of the magnetization M, image magnetic domain patterns or investigate the dynamics of M on short time scales. Here, the linear MOKE (LinMOKE) being proportional to M is regularly utilized for investigations of ferromagnetic samples while the quadratic MOKE (QMOKE) being proportional to M2 [1] is the tool to study antiferromagnetic properties and sense the structural order in Heusler compounds [2].
We recently explored the third-order MOKE, so-called cubic MOKE (CMOKE), being proportional to M3, which depends on the degree of structural domain twinning [3]. The individual MOKE contributions can experimentally be separated by the eight-directional method, i.e. by applying an external magnetic field in various in-plane sample directions for different orientations of the crystal structure. Within this talk, we will introduce the CMOKE and discuss its dependency on twinning properties, materials and crystal orientations. In addition, we will point out potential future applications of CMOKE.
[1] R. Silber et al., Phys. Rev. B 100, 064403 (2019)
[2] R. Silber et al., Appl. Phys. Lett. 116, 262401 (2020)
[3] M. Gaerner et al., arXiv: 2205.08298
Keywords: magnetooptic Kerr effect; MOKE; higher order effects; quadratic MOKE; magnetic thin films