Scaling of quadratic and linear magnetooptic Kerr effect spectra with L2${}_1$ ordering of Co${}_2$MnSi Heusler compound

Abstract

The Heusler compound Co${}_2$MnSi provides a crystallographic transition from B2 to L2${}_1$ structure with increasing annealing temperature $T_a$, being a model system for investigating the influence of crystallographic ordering on structural, magnetic, optic, and magnetooptic (MO) properties. Here, we present quadratic magnetooptic Kerr effect (QMOKE) spectra depending on $M^2$ in addition to the linear magnetooptic Kerr effect (LinMOKE) spectra being proportional to $M$, both in the extended visible spectral range of light from 0.8\,eV to 5.5\,eV. We investigated a set of Co${}_2$MnSi thin films deposited on MgO(001) substrates and annealed from 300${}^{\circ }$C to 500${}^{\circ }$C. The amplitude of LinMOKE and QMOKE spectra scales linearly with $T_a$, and this effect is well pronounced at the resonant peaks below 2.0\,eV of the QMOKE spectra. Furthermore, the spectra of the MO parameters, which fully describe the MO response of Co${}_2$MnSi up to the second order in $M$, are obtained dependend on $T_a$. Finally, the spectra are compared to ab-initio calculations of a purely L2${}_1$ ordered Co${}_2$MnSi Heusler compound.

arXiv comment4 pages, 3 figures, supplemental pdf, supplemental data files

References in corpus (5)

• Huge quadratic magneto-optical Kerr effect and magnetization reversal in the Co${}_2$FeSi Heusler compound
• Quadratic magnetooptic Kerr effect spectroscopy of Fe epitaxial films on MgO(001) substrates
• Ion beam induced modification of exchange interaction and spin-orbit coupling in the Co${}_2$FeSi Heusler compound
• Principal spectra describing magnetooptic permittivity tensor in cubic crystals
• Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation

Cited by in corpus (4)

• Cubic magneto-optic Kerr effect in Ni(111) thin films with and without twinning
• Cubic magneto-optic Kerr effect in Co(111) thin films
• Cubic-in-magnetization contributions to the magneto-optic Kerr effect investigated for Ni(001) and Ni(111) thin films
• Twinning in ferromagnetic Heusler Rh2MnSb epitaxial thin films