Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-12-12
2006-12-12
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
07147941
ABSTRACT:
A perpendicular magnetic recording medium which has been improved to be suitable for high-density magnetic recording and a magnetic recording apparatus using the medium are provided. The magnetic back film of a dual-layer perpendicular recording medium is caused to be constituted by a plurality of layers, and a keeper layer17for keeping perpendicular magnetization and layers13and15for improving the recording efficiency of a recording head are functionally separated from one another. Further, the magnetization orientations of the soft magnetic films excluding the keeper layer are defined to be in the circumferential direction of the disk, whereby the frequency of occurrence of noise is decreased.
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Futamoto Masaaki
Hirayama Yoshiyuki
Honda Yukio
Kikugawa Atsushi
Yoshida Kazuetsu
Hitachi , Ltd.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Rickman Holly
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