Abstract

Amorphous Co 80− x Er x B 20 alloys have been prepared by melt spinning technique and their magnetic properties have been studied. The mean field theory has been used to explain the temperature dependence of the magnetization. High-field magnetization studies performed at 4.2 K in magnetic fields up to 38 T have revealed, for samples with stoichiometry close to that of a compensated ferrimagnet, a magnetic behavior that is characteristic of a non-collinear magnetic structure of the Er and Co sublattices. From the non-collinear regime the exchange interactions between the Co and Er magnetic sublattices and the magnetic anisotropy constants have been evaluated. The region of the canted moments can be described by a phase diagram in H– T plane.

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