高抵抗軟磁性Ｆｅ‐Ａｌ‐Ｏグラニュラー膜の磁区構造

概要

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In our previous study of Fe-Al-O high-resistivity granular films, we proposed a microscopic shape anisotropy model and successfully explained the behavior of the uniaxial anisotropy of the films. To confirm the validity of this model, the relations between the anisotropy fields and the stiffness constants of the films were investigated by domain observation. Fe-Al-O stripe samples with widths of 50 μm and 10 μm and thickness of 0.3 μm were prepared. Their uniaxial anisotropy fields were adjusted in the range from 0.5 to 162.5 Oe, and the easy axes were set perpendicular to the stripe direction. All the domains of these samples are of a flux closure type. From the observed domain periods, the domain wall energy and stiffness constants were calculated. It was found that the exchange stiffness constants along the hard axis were smaller than those along the easy axis and much smaller than that of the pure Fe. This result supports the proposed microscopic shape anisotropy model, and furthermore, implies that the films have a great advantage as thin-film cores in downsized elements such as recording heads and inductors.
社団法人日本磁気学会の論文