Preparation of Cobalt-Modified γ-Fe_2O_3 Thin Films and Their Surface Structures : Magnetism, Magnetic Materials and Devices

概要

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Cobalt modification was made in a wet process for the γ-Fe_2O_3 thin films which were derived from iron thin films prepared by a vacuum evaporation method. The surface structures were closely investigated by X-ray diffraction, electron microscopic observations of surface replica films, reflection electron diffraction, and ESCA, and were discussed with the magnetic properties. In the modification reaction at 55℃ by a simultaneous addition of iron and cobalt ions,σ-(Fe_<0.67>Co_<0.33>)OOH particles which were attached to the spinel-modified layer were detected. The diffusion of the particles into the film and the resulting formation of a spinel phase were found to play important roles in the improvement of the magnetic properties.
社団法人応用物理学会の論文
1988-05-20