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MA: Fachverband Magnetismus
MA 23: Focus Session: Magneto-Transport and Magneto-Optics of Higher Orders in Magnetization I
MA 23.2: Hauptvortrag
Mittwoch, 19. März 2025, 10:00–10:30, H20
Cubic magneto-optic Kerr effect in thin films depending on structural domain twinning and crystal orientation — •Robin Silber1, Maik Gaerner2, Jaroslav Hamrle3, and Timo Kuschel2 — 1VSB - Technical University of Ostrava, Czechia — 2Bielefeld University, Germany — 3Charles University, Czechia
Many of the second-order effects in magnetization in magneto-transport and magneto-optics are of practical importance in research and applications today. In the case of magneto-optic Kerr effect (MOKE), the second-order effect (quadratic MOKE) has been utilized to e.g. study antiferromagnetics [1] or to investigate spin-orbit torques in insulating structures [2], while the third-order effect (cubic MOKE, CMOKE) has only been discussed rarely so far [3, 4]. Here we provide a solid theoretical background for the phenomenological description of CMOKE for (111)- and (001)-oriented cubic crystal structures and compare the results with the experimental data collected on Ni(111) and Ni(001) thin film samples. CMOKE manifests as a three-fold angular dependence in Ni(111) thin films while for Ni(001) a four-fold angular dependence of CMOKE is predicted. The dependence on the incidence angle is changing from one to the other crystal orientation. Furthermore, the strength of the CMOKE is also sensitive to the degree of twinning of the Ni(111) thin film [4].
[1] V. Saidl et al., Nat. Photonics 11, 91 (2017).
[2] M. Montazeri et al., Nat. Commun. 6, 8958 (2015).
[3] A. V. Petukhov et al., J. Appl. Phys. 83, 6742 (1998).
[4] M. Gaerner et al., Phys. Rev. Applied 22, 024066 (2024).
Keywords: CMOKE; QMOKE; higher orders in magnetization; (111) oriented nickel; twinning