Abstract
Bi–Co multilayers with a constant t Bi of 6.0 nm and a various t Co are prepared by alternate evaporation. The films grow into a new metastable rhombohederal phase for low t Co and metastable amorphous phases for large t Co. The influence of the structural evolution of the films from crystalline to amorphous on the magnetic properties of Bi–Co multilayers is investigated. Ferromagnetic properties are found in both the crystalline and the amorphous films, and that for amorphous alloy films are studied using Buschow’s model. The contribution of amorphous microstructure, i.e. the number of Bi neighbors surrounding Co atom and the degree of compositional short-range ordering in Bi–Co amorphous alloy films, to the magnetic properties are discussed in terms of heat of formation.
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