Quadratic magnetooptic Kerr effect spectroscopy of Fe epitaxial films on MgO(001) substrates

Abstract

The magnetooptic Kerr effect (MOKE) is a well known and handy tool to characterize ferro-, ferri- and antiferromagnetic materials. Many of the MOKE techniques employ effects solely linear in magnetization $\mathbf{M}$. Nevertheless, a higher-order term being proportional to ${\mathbf{M}}^2$ and called quadratic MOKE (QMOKE) can additionally contribute to the experimental data. Here, we present detailed QMOKE spectroscopy measurements in the range of 0.8 -- 5.5\,eV based on a modified 8-directional method applied on ferromagnetic bcc Fe thin films grown on MgO substrates. From the measured QMOKE spectra, two further complex spectra of the QMOKE parameters $G_s$ and $2G_{44}$ are yielded. The difference between those two parameters, known as $\Delta G$, denotes the strength of the QMOKE anisotropy. Those QMOKE parameters give rise to the QMOKE tensor $\mathbf{G}$, fully describing the perturbation of the permittivity tensor in the second order in $\mathbf{M}$ for cubic crystal structures. We further present experimental measurements of ellipsometry and linear MOKE spectra, wherefrom permittivity in the zeroth and the first order in $\mathbf{M}$ are obtained, respectively. Finally, all those spectra are described by ab-initio calculations.

arXiv comment15 pages + references, , 15 Figures

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• Cubic magneto-optic Kerr effect in Ni(111) thin films with and without twinning
• Quadratic magneto-optical Kerr effect spectroscopy: Polarization variation method for investigation of magnetic and magneto-optical anisotropies
• Cubic magneto-optic Kerr effect in Co(111) thin films
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