Torque measurements of induced anisotropy in amorphous Fe80-xB20+x alloys

摘要

Torque magnetometer measurements were used to obtain the anisotropy energy ku induced by magnetic annealing (up to 6 h at temperatures from 50 to 70 °C below crystallization) on special patchwork samples of amorphous Fe80-xB20+x ribbons (-6⩽x⩽+6). The dependence of ku on annealing time and temperature tends to show that the directional ordering processes are characterized by a very wide distribution of activation energies. At a constant temperature and time ku is independent of composition, as was also found in results on stress relaxation but not in results on crystallization. Thus different atomic processes control ku than control crystallization.