Disorder-induced spin-glass state in amorphous Heusler alloys

Abstract
The magnetic dc susceptibility of several amorphous films of Mn-based Heusler alloys exhibits a cusp, characteristic of spin-glass freezing. The cusp temperatures are an order of magnitude smaller than the Curie temperatures of their ferromagnetic crystalline counterparts. The occurrence of the spin-glass state is interpreted in terms of competition between long-range indirect ferromagnetic exchange and direct antiferromagnetic overlap.

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