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Superstructure Effects on Thin-Film Magnetic Anisotropy

Recent model calculations for thin-film antiferromagnetic superstructure show that the magnetic-anisotropy energy (MAE) and the orbital magnetic moment can be anomalously large although it is problematic if the corresponding structures are stable. For this reason it is interesting to consider superstructures that might be prepared in thin bimetallic films. In this paper we study the hypothetical c(2 × 2) FeCo and CoNi alloy (001) monolayers within a tight-binding d-band model. The MAE is in both cases above 1 meV/A-B pair and prefers the in-plane (perpendicular) direction of magnetization for FeCo (CoNi). The Co atoms in CoNi have a considerable magnetic orbital moment (∼ 0.5μB).