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We have explored the relationship between epitaxial growth and magnetism in the case of ultrathin fcc-Co films by means of a multitechnique approach. For high-quality fcc-Co films less than 3 monolayers thick the Curie temperatures T₂ are dramatically lower than T₂^B of bulk fcc-Co and decease distinctly with film thickness. In contrast to previous claims, T₂ of a single monolayer appears to be far below 300 K. Substrate topology is found to strongly influence the structural perfection of the films which in turn determines their magnetic properties (Curie temperature, coercive field, and anisotropies).
Schneider et al. (1990) studied this question.