Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-06-27
2006-06-27
Chaney, Carol (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S831000, C360S135000
Reexamination Certificate
active
07067206
ABSTRACT:
A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal close packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
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US RE37,748, 06/2002, Chen et al. (withdrawn)
Oikawa et al, High Performance CoPtCrO Single Layered Perpendicular Media, IEEE vol. 36 pp. 2393-2395.
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Nakamura Miyabi
Oikawa Tadaaki
Sakai Yasushi
Uwazumi Hiroyuki
Chaney Carol
Falasco Louis
Fuji Electric & Co., Ltd.
Rossi Kimms & McDowell LLP
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