Abstract
Amorphous Fe 80− x Gd x B 20 alloys have been prepared by melt spinning and their magnetic properties have been studied. Mean-field theory has been used to explain the temperature dependence of the magnetization. High-field magnetization studies on samples with stoichiometry close to that of a compensated ferrimagnet show a magnetic behaviour that is characteristic of a non-collinear magnetic structure of the Gd and Fe sublattices. From the non-collinear regime the exchange interaction between the Fe and Gd magnetic sublattices have been evaluated. The J GdFe values derived in this way are compared with values of the exchange interactions obtained by mean-field theory. The region of the canted moments can be described by a phase diagram in H– T plane.
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