Phenomenological Approach to the Dependence of Magnetic Anisotropy on Co Layer Thickness in Epitaxial Au/Co and Au/Co/Ag Superlattices

概要

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Co-layer-thickness (t) dependences of magnetic anisotropy energies (K_<eff>) in epitaxial (111) Au/Co and (111) Au/Co/Ag superlattices are interpreted phenomenologically. Saturation of K_<eff>t at small t in a t - K_<eff>t plot is attributed to two nonidentical interfaces of each Co layer and the gradient of Co-layer in-plane strain in the thickness direction. The strains are estimated from the results of in situ reflection high-energy electron diffractometry, which were reported earlier, taking electron penetration to the near-surface regions into account. The magnetoelastic interface anisotropy contributing to the perpendicular magnetic anisotropy is suggested to arise from a larger magnetoelastic constant than that in bulk Co, which is in agreement with recent theoretical calculations.
社団法人応用物理学会の論文
1997-12-15