Random anisotropy studies in amorphous Fe80-x+x’HoxB20-x’ alloys (0<x<16; 0<x’<4)

In this paper, we have carried out a systematic study of the exchange and anisotropy effects on magnetic behavior of amorphous Fe80-x+x’HoxB20-x’ (0<x<17; 0<x’<4) alloys. Primary analysis of magnetization data have led to the conclusion that the holmium magnetic structure is collinear. Exchange parameters, governing the magnetic ordering of our alloys, have been calculated from both mean field theory and high-field magnetization analyses. Study of the magnetization using the Chudnovsky’s real space model has allowed us to determine the overall anisotropy constant, KL, from which we have determined, separately, the anisotropy energies for the iron and the holmium sublattices. Comparison of these two parameters to the exchange energies shows that the anisotropy to exchange ratio is small in these alloys.