Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2008-03-14
2011-10-11
Bernatz, Kevin (Department: 1785)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S832100, C428S836200, C428S836300, C204S192200
Reexamination Certificate
active
08034470
ABSTRACT:
A perpendicular magnetic recording medium is disclosed in which a soft magnetic layer used as a low Kulayer can be stably produced with high performance. Thermal stabilization of magnetization, ease of writing by a magnetic head, and SNR also are improved. A method of manufacturing the medium is disclosed. The perpendicular magnetic recording medium includes at least a nonmagnetic underlayer, a magnetic recording layer, and a protective layer formed in this order on a nonmagnetic substrate. The magnetic recording layer includes a low Kulayer having a relatively small perpendicular magnetic anisotropy constant (Kuvalue), and a high Kulayer in which the Kuvalue is relatively large, and the low Kulayer includes a soft magnetic thin film including an iron group element-based microcrystal structure, in which a nitrogen element is added to a ferromagnetic material mainly containing one of metals of Co, Ni and Fe or an alloy of the metal. The thin film has a crystal structure of a face-centered cubic lattice or hexagonal close packed, and a preferred crystal orientation plane parallel to a plane of the film is a (111) plane in the face-centered cubic lattice structure, and a (002) plane in the hexagonal close packed structure.
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Oikawa Tadaaki
Uwazumi Hiroyuki
Bernatz Kevin
Fuji Electric & Co., Ltd.
Rossi Kimms & McDowell LLP
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