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Cubic-in-magnetization contributions to the magneto-optic Kerr effect investigated for Ni(001) and Ni(111) thin films

Robin Silber1,2,*,†, Maik Gaerner3,†, Kamil Postava1, Jaroslav Hamrle4,5, and Timo Kuschel3,6

  • *Contact author: robin.silber@vsb.cz
  • †These authors contributed equally to this work.
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Phys. Rev. B 114, 014418 – Published 15 July, 2026

DOI: https://doi.org/10.1103/c82k-w836

Abstract

The existence of higher-order effects in magnetization in magneto-transport and magneto-optic phenomena is well known. These effects are of importance not only in research but also directly in applications. Anisotropic magneto-resistance, anisotropic magneto-thermopower, quadratic magneto-optic Kerr effect (QMOKE), Voigt effect, or x-ray linear magnetic dichroism (and birefringence)—all of these are effects of second order in magnetization. Recently, we have reported on systematic observations of the cubic-in-magnetization magneto-optic Kerr effect (CMOKE) in Ni(111) thin films. In this paper, we introduce the detailed theory of CMOKE by deriving the magneto-optic tensor of third order in magnetization, denoted as H, and comparing the strength of CMOKE for different crystal orientations theoretically and experimentally. In crystals with cubic symmetry, the tensor H is described by two independent parameters H123 and H125. Together with the linear magneto-optic tensor K and quadratic magneto-optic tensor G, the permittivity tensor is described up to third order in magnetization. We analytically describe equations of the magneto-optic Kerr effect (MOKE), including the contribution of QMOKE and CMOKE themselves for (001)- and (111)-oriented cubic crystal structures. Those are compared with experimental measurements of two samples with an (001)- and (111)-oriented fcc Ni layer, respectively. The experimental data are measured using the so-called eight-directional method, which was developed to separate linear and quadratic MOKE contributions and to observe their individual anisotropic dependence on the crystal lattice direction but is applicable to CMOKE contributions as well. Furthermore, we use Yeh's 4×4 transfer matrix calculus to simulate and describe the experimental measurements phenomenologically from the permittivity tensor developed up to third order in magnetization. This allows us to obtain the values of the magneto-optic parameters of the Ni layer for both crystal orientations. We find that the MOKE anisotropy that stems from the magneto-optic tensor H described as ΔH=H123−3H125, is much more pronounced for the (111)-oriented cubic crystal structure, for which it manifests as threefold in-plane angular dependencies of MOKE with longitudinal and also with transversal magnetization direction, respectively. For (001)-oriented cubic crystal structures, ΔH should manifest as a fourfold angular dependence of the MOKE with longitudinal and transversal magnetization directions, but its amplitude is predicted to be smaller than in the case of the (111)-oriented cubic crystal structure, which may explain why the CMOKE has not yet been experimentally identified in (001)-oriented cubic crystal structures.

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Phys. Rev. B 114, 014418– Published 15 July, 2026
  • Received 5 March 2026
  • Accepted 8 June 2026
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