Abstract
Amorphous (Fe1—xGdx)80B20 alloys have been prepared by melt spinning technique and their magnetic properties have been studied. The Gd moment at 10 K is found to be 7μB which agrees with the theoretical value indicating a collinear spin structure. The magnetic compensation at 10 K occurs for x close to 0.195. The mean-field theory has been used to explain the temperature dependence of the magnetization. The exchange interactions between Fe–Fe, Fe–Gd and Gd–Gd atom pairs have also been evaluated. From an analysis of the approach to saturation magnetization, the local random anisotropy constant KL has been extracted. It is found that KL decreases with increasing Gd concentration. This result suggests that the substitution of Fe with Gd seems to favor the increase of magnetic order by reducing the random anisotropy.
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