^57FeメスバウアープローブによるCo/Au人工格子の磁気構造

概要

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Using a local-doping technique with ^<57>Fe Mossbauer probes, a depth-dependent micromagnetic structure in [Co (20A)/Au(20A)]_<N-1>/Co(20) multilayer films with perpendicular anisotropy was investigated. As a result, (1) a smooth spin reorientation from in-plane to out-of-plane was found as a function of the laminating number N accompanied by a change in the micromagnetic structure, and (2) the average spin orientation and dipole field in Co layers of [Co/Au]_<30>/Co were found to by strongly depthdependent, that is, they were closer to the film normal at the middle part of the multilayer than near the surface. The latter findings were attributed to the presence of a flux closure pattern in the perpendicular plane throughout the multilayer structure. The paper also discusses a spin rearrangement phase transition of the magnetic multidomain structure in a [ferromagnetic/nonmagnetic]_N multilayer film with moderate perpendicular anisotropy as a parameter of N.
社団法人日本磁気学会の論文
1998-04-15