高密度磁気記録用バリウムフェライト薄膜媒体の開発動向と将来

概要

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This article will focus on the last twoo decades of researches on Ba-ferrite thin films for high-density perpendicular magnetic recording medium. The main advantages of Ba-ferrite thin film are its chemical stability and mechanical strength in comparison with other metallic thin-film media. These advantages make it possible to creat high-density recording media with-out any protective layer on their surface. In order to prepare Ba-ferrite thin film with small grain size, several kinds of additives or under-layers were used. Ba-ferrite thin films with grain size of 20 to 40 nm were prepared on Pt or amorphous aluminum oxide under-layers. The linear recording density for a Ba-ferrite thin-film disk is around 200 kFRPI. The key issue is how to design Ba ferrite thin film that has magnetically decoupled small grains with c-axis orientation by post-deposition annealing.
社団法人日本磁気学会の論文
2002-07-01