Abstract
Iron-rich amorphous alloys with non-magnetic transition metals or rare-earth metals show a rich variety of complex spin structures that have been described as spin-glass-like, spero- or asperomagnetic. Standard local-spin-density (LSD) calculations yield only an Ising-like description of the magnetic structure. The present authors recently presented a technique for a self-consistent calculation of non-collinear spin structures in crystalline and amorphous alloys based on a tight-binding Hubbard Hamiltonian generated via a canonical transformation of the LSD Hamiltonian. This approach has been used to analyze the magnetic properties of Fe-rich amorphous Fe-Y alloys. It is shown that in the limit of very high Fe concentrations the orientation of the magnetic moments is almost, but not completely, random. Hence the Fe-rich amorphous Fe-Y alloys are correctly described as asperomagnets.
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