Optical and Magneto-Optical Properties of Fe-Mn Alloy Films

The electronic structures of α-Fe (bcc structure) and γ-FeMn (L10 structure) were calculated by using the all-electron full-potential linearized-augmented-plane-wave method within the generalizedgradient approximation. Both diagonal and off-diagonal components of the optical-conductivity (OC) tensor were calculated from the calculated electronic structures. The calculated OC spectra, both diagonal and off-diagonal, are compared with the experimental spectra of pure Fe, Mn-diluted (2.5 at.% of Mn concentration) Fe alloy film, and near-equiatomic FexMn1−x alloy films with x = 0.642 and 0.409. By applying the so-called λ-fitting, which simulates the effects of the real part of self-energy, the calculated OC spectra can successfully reproduce the experimental ones.