Mössbauer study of the radio frequency induced effects in amorphous Fe xCo 78−xSi 9B 13 alloys in amorphous Fe xCo 78− xSi 9B 13 alloys

Abstract

The structural properties and crystallization of amorphous Fe x Co 78− x Si 9B 13 alloys were studied using the Mössbauer technique. The radio frequency (rf) induced collapse of the magnetic hyperfine splitting allowed a direct determination of the quadrupole splitting as a function of composition of ferromagnetic amorphous alloys. It was found that alloys with x < 62 crystallized rapidly in the rf field making the observation of the rf collapse impossible. The rf induced crystallization was studied as a function of time of rf exposure and intensity of the rf field. The dependence of the relative abundance of the crystalline phases α-(FeCo), (FeCo) 2(SiB) and (FeCo) 3(SiB) formed by crystallization is reported. The study of magnetic field distributions and the variation of magnetic field vs. composition for amorphous and crystalline phases permits conclusions about short range order in the amorphous state.