Novel soft magnetic underlayer for double-layered perpendicular magnetic recording media: Electroless-deposited films of CoNiFe-based alloy

Toru Asahi*, Tokihiko Yokoshima, Jun Kawaji, Tetsuya Osaka, Hiroshi Ohta, Masahiro Ohmori, Hiroshi Sakai

*この研究の対応する著者

研究成果: Article査読

19 被引用数 (Scopus)

抄録

We present a novel fabrication process for a soft magnetic underlayer of a CoNiFe-based alloy for a double-layered perpendicular magnetic recording medium using electroless deposition. The electroless-deposited CoNiFeP film is focused on as the soft magnetic underlayer. The CoNiFeP soft magnetic underlayer was fabricated on a 2.5-in glass disk with a Ni/Ti seed layer and the substrate was rotated in an electroless deposition bath under a magnetic field applied. The CoNiFeP underlayer as deposited was flattened using a chemical mechanical polishing, and the film thickness thereby became about 1 μm. The in-plane coercivity and saturation magnetic flux density of the CoNiFeP underlayer were less than 2 Oe and more than 12 kG, respectively. The magnetic domain observation revealed that the CoNiFeP underlayer electroless deposited under the magnetic field applied and the substrate rotated exhibited no marked domain boundary, vanishing a spike noise in read-write experiments. A double-layered perpendicular magnetic recording medium with the electroless-deposited CoNiFeP film showed a sufficient overwrite performance and high signal-to-noise ratio as compared with a typical soft magnetic underlayer fabricated using sputtering.

本文言語English
ページ(範囲)2356-2358
ページ数3
ジャーナルIEEE Transactions on Magnetics
40
4 II
DOI
出版ステータスPublished - 2004 7月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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