Abstract
Magnetic, optical, and magneto-optical (MO) properties of nanocrystalline and amorphous ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ $(0.0<~x<~0.5)$ alloy films prepared by dc magnetron sputtering were investigated in the as-deposited state and after annealing at 710 K. The optical conductivity (OC) spectrum of amorphous ${\mathrm{Fe}}_{0.51}{\mathrm{Si}}_{0.49}$ alloy film shows a great resemblance to the OC spectrum of crystalline $\ensuremath{\epsilon}\ensuremath{-}\mathrm{FeSi}$ $(B20)$ which implies that the same type of short-range order is formed in this amorphous phase. All the crystalline ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ alloy films with $0.30<~x<~0.49$ exhibit a prominent absorption peak near 2.5--3.1 eV. The MO responses for nanocrystalline ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ alloy films $(0.21<~x<~0.30)$ exceed those of pure Fe films. Such an enhancement is closely related to the interplay between the optical properties of Fe and ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ alloy films.
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