Abstract
The polar Kerr rotation and ellipticity spectra of epitaxially grown (001)-oriented half-metallic Sr2FeMoO6 thin films have been determined in the photon energy range from 1.2 to 4.9 eV. The Kerr rotation spectrum shows three maxima at E=1.6, 4.0, and 4.65 eV. The maxima at 4.0 and 4.65 eV are consistent with spin-polarized band structure calculations for interband transitions from the O-2p to the minority-spin π*Mo/Fe and majority-spin Mo-t2g bands, respectively. The overall maximum intrinsic Kerr rotation is ΘK=−0.045° at a photon energy of 4.65 eV. The maximum of ΘK at E=1.6 eV coincides with a minimum in the reflectivity due to the plasma edge of Sr2FeMoO6 and, therefore, is not related to an interband transition.
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