Abstract

In amorphous FeBP alloys we have observed the appearance of a non-monotonic dependence of the ΔE effect on magnetic field after annealing at temperatures above 300 °C. The results obtained show that this behaviour of the ΔE effect is due to a thermostimulated magnetic anisotropy perpendicular to the ribbon plane. It has been observed that after removing the near-surface layer by chemical etching, if the depth of the removed layer is greater than a certain value, the ΔE effect behaviour becomes time dependent. It is proposed that the induced magnetic anisotropy and the unusual behaviour of the ΔE effect are caused by a change in the chemical composition of the near-surface layer during heat treatment.

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