めっき型磁気ディスクの微細構造と媒体ノイズ (湿式法による磁気記録媒体<特集>)

概要

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Codeposition of zinc remarkably reduces the media noise in electroless plated disks. This study was designed to investigate the effects of zinc on the noise and magnetic properties of textured plated disks Codeposition of zinc reduces the grain size of the film and improves S/N ratio of the disk In terms of the magnetic properties, the addition of zink was found to result in a decrease in squarness and anisotropy in coercivity between the circumferential and radial directions TEM-EDX analysis showed segregation of zinc and phosphorous at the grain boundaries of the film, and this segregation decreased the magnetic interaction at grain bounndaries and consequently reduced the media noise Both zink and phosphorous in the film were found to exist in a metallic as well as an ionic state, ratio between these states being dependent on the pH of the plated bath
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