SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.12: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Quadratic and third-order magneto-optic Kerr effect in Ni(111) thin films with and without twinning — •Maik Gaerner1, Robin Silber2, Tobias Peters1, Jaroslav Hamrle3, and Timo Kuschel1 — 1Bielefeld University, Germany — 2IT4Innovations, VŠB - Technical University of Ostrava, Czech Republic — 3Charles University, Prague, Czech Republic
To separate and study the dependencies of the linear magneto-optic Kerr effect (MOKE) and quadratic MOKE on the crystallographic direction, the so-called eight-directional method can be used [1]. So far, this method or similar ones have been utilized to characterize (001)- and (011)-oriented thin films of cubic crystal structure [2,3]. Here, we apply the eight-directional method to Ni(111) thin films and report on a strong three-fold anisotropy in longitudinal MOKE (LMOKE). This anisotropy can be explained by theory as an optical interplay of elements in the permittivity tensors of first and second order in M, effectively creating cubic MOKE contributions, i.e., MOKE of third order in M. Furthermore, we observe that in a Ni(111) thin film with twinning (two structural (111) phases with 60 deg. in-plane rotation), those oscillations are substantially reduced compared to a thin film with almost no twinning. This indicates that the LMOKE anisotropy truly is of crystallographic origin in the ferromagnetic layer and is not due to other, e.g., interface effects.
[1] K. Postava et al., J. Appl. Phys. 91, 7293 (2002)
[2] R. Silber et al., Phys. Rev. B 100, 064403 (2019)
[3] J. H. Liang et al., Appl. Phys. Lett. 108, 082404 (2016)