DEVELOPMENT OF ELECTROLESS PLATED MAGNETIC MEDIA FOR PERPENDICULAR RECORDING.

Tetsuya Osaka, Ichiro Koiwa

Research output: Contribution to journalArticle

Abstract

Cobalt alloy films for perpendicular magnetic recording media were developed and their recording characteristics were evaluated by using eight-inch disks with Winchester ring head. The following results were obtained: 1) The hcp structure of Co alloy was oriented normal to the film plane with the Mn codeposition into the films. 2) Nickel codeposition caused a decrease in Ms, and further Re codeposition made it possible to produce perpendicular magnetic anisotropy films because of effective Ms decrease. 3) Eight-inch perpendicular recording disks using Co-Ni-Re-Mn-P alloy were prepared from an ammoniacal malonate-tartrate-succinate mixed complex agents bath with high qualified magnetic uniformity. 4) Recording performance using Winchester heads under practical usable conditions gave excellent results, such as D//5//0 equals 51 kFRPI with favorable overwrite and SNR under the condition of 0. 50 mu thick medium, 0. 33 mu m gap length head and 0. 20 mu m head-medium spacing.

Original languageEnglish
Pages (from-to)1-22
Number of pages22
JournalMemoirs of the School of Science and Engineering, Waseda University
Issue number48
Publication statusPublished - 1984

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Cobalt alloys
Magnetic recording
Magnetic anisotropy
Nickel

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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abstract = "Cobalt alloy films for perpendicular magnetic recording media were developed and their recording characteristics were evaluated by using eight-inch disks with Winchester ring head. The following results were obtained: 1) The hcp structure of Co alloy was oriented normal to the film plane with the Mn codeposition into the films. 2) Nickel codeposition caused a decrease in Ms, and further Re codeposition made it possible to produce perpendicular magnetic anisotropy films because of effective Ms decrease. 3) Eight-inch perpendicular recording disks using Co-Ni-Re-Mn-P alloy were prepared from an ammoniacal malonate-tartrate-succinate mixed complex agents bath with high qualified magnetic uniformity. 4) Recording performance using Winchester heads under practical usable conditions gave excellent results, such as D//5//0 equals 51 kFRPI with favorable overwrite and SNR under the condition of 0. 50 mu thick medium, 0. 33 mu m gap length head and 0. 20 mu m head-medium spacing.",
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AU - Osaka, Tetsuya

AU - Koiwa, Ichiro

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