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We investigate the anisotropy of the optical properties of thin Fe films onGaAs(001) from first-principles calculations. Both intrinsic andmagnetization-induced anisotropy are covered by studying the system in thepresence of spin-orbit coupling and external magnetic fields. We use thelinearized augmented plane wave method, as implemented in the WIEN2k densityfunctional theory code, to show that the $C_{2v}$ symmetric anisotropy of thespin-orbit coupling fields at the Fe/GaAs(001) interface manifests itself inthe corresponding anisotropy of the optical conductivity and the polarmagneto-optical Kerr effect. While their magnetization-induced anisotropy isnegligible, the intrinsic anisotropy of the optical properties is significantand reflects the underlying $C_{2v}$ symmetry of the Fe/GaAs(001) interface.This suggests that the effects of anisotropic spin-orbit coupling fields inexperimentally relevant Fe/GaAs(001) slabs can be studied by purely opticalmeans.

Anisotropic optical properties of Fe/GaAs(001) nanolayers from first principles