Abstract
Structural and magnetic studies of amorphous RE(Fe 1− x Al x ) 13 alloys (RE ≡ rare earth metal) have been carried out. These alloys consisted of icosahedral clusters which exist in the crystalline state. The nearest-neighbor distance of the FeFe pairs is about 2.5 Å. Their isomer shifts are almost the same, suggesting a similar electronic state. These alloys exhibit a re-entrant spin-glass behavior and the spin freezing temperature is hardly changed by replacing RE because there is not change in the FeFe distance in the icosahedral clusters. On the contrary, the Curie temperature depends on the RE in a similar manner to that of many Fe-based amorphous alloys.
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