Funct. Mater. 2021; 28 (2): 259-265.
Dielectric tensor circular anisotropy in Co- and Fe-based ferromagnetic alloys
T.Shevchenko National University of Kyiv, 64/13 Volodymyrs'ka Str., 01601 Kyiv, Ukraine
It has been shown that the off-diagonal components of the dielectric tensor are interconnected by an additional relation, which is a consequence of the spatial isotropy of metal alloys. Anisotropy of the reflected circularly polarized light is possible in ferromagnetic alloys due to the magneto-optical Kerr effect which depends on the non-diagonal components. Spectral ellipsometric measurements in Co- and Fe-based alloys revealed this effect, which occurs when the direction of magnetization deviates from the normal to the sample surface. Ab initio electronic structure calculations for supercells with structures similar to the experimentally investigated alloys made it possible to construct dispersion curves of the dielectric tensor components and to confirm the experimental results.
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