Magnetic moment and Curie temperature for amorphous Fe100−Gd alloys (18≦X≦60)

Abstract The magnetic properties of melt–spun amorphous Fe 100− X Gd X alloys were investigated over a wide concentration range (18≦ X ≦60). The temperature dependence of magnetization showed characteristic curves of the ferrimagnetism depending on the concentration. In the Gd-rich region, a characteristic temperature dependence of magnetization, the so-called inflection-like behavior, was observed and found to be intrinsic. Assuming 7 μ B of Gd moment, the Fe magnetic moment was about 2 μ B irrespective of the concentration and this is quite different from the result for the vapor-quenched samples. The Curie temperatures of the melt–spun samples were higher by about 70° than those of the vapor-quenched ones. The discrepancy was ascribed to that of the Fe magnetic moment and the exchange interaction constants J Gd–Fe and J Gd–Gd between these samples.