Abstract

Nanostructured grains of amorphous ferromagnetic alloy Co41Fe39B20 included in amorphous dielectric matrix SiO2 have been produced for investigation of this alloy’s optical properties by ellipsometry methods in the wavelength range from 0.24 to 1.0 µm and surface structure by the atomic force microscopy method. Formation of Fe clusters with Co and B inclusions producing intense and additional bands that are related with electron transitions from the base states located near Fe to impurity states formed by Co has been shown. The comparison of measured data for Co41Fe39B20 with theoretical calculations for Co2Fe2B demonstrated that intensive absorption bands in Fe–Co–B compounds are also formed as the result of the transition from s- and p-states of B to electronic states near Fe and Co. Sufficient widening of energy zones, located above the Fermi level, is happening due to strong scattering of electrons, the electrons’ participation in the light absorption, as well as the finite lifetime of the excited electrons, which has led to sufficient widening of appropriate bands in optical conductivity spectrum σ(hν).

© 2018 Optical Society of America

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