Co-CoO斜め蒸着テープの結晶粒内異方性磁界に関する考察(磁気記録)

概要

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We investigated the relationship between the shape of clusters of Co crystallites, obtained by transmission electron microscopy (TEM), and the magnetic anisotropy field of grains (H_k^<grain>) of Co-CoO obliquely evaporated magnetic tape. Comparison of the former with the latter revealed that the H_k^<grain> of Co-CoO obliquely evaporated magnetic tape closely correlates with the aspect ratio (N) of clusters of Co crystallites. The magnitude of H_k^<grain> is defined as that of a magnetic field where the rotational hysteresis loss of the torque curve is zero. We investigated the relationship between the H_k^<grain> and saturation magnetization M_s, using samples prepared under various conditions. The results showed that H_k^<grain> becomes asymptotic to the value H_<kCo> + M_s/2. determined by the maximum value of the shape anisotropy M_s/2 in the region of low M_s. The value of H_k^<grain> calculated by using a value of ^MN obtained from TEM images was found to be close to the value of H_k^<grain> obtained by magnetic torque measurement, and this tendency was confirmed qualitatively.
社団法人日本磁気学会の論文
2004-03-01