Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2006-04-18
2006-04-18
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S828000
Reexamination Certificate
active
07029772
ABSTRACT:
A magnetic recording medium that enables enhancement of squareness ratio and Hn and exhibits excellent noise characteristics and thermal stability is disclosed. A production process for the medium, and a magnetic recording and reproducing apparatus are also disclosed. The magnetic recording medium including a substrate1, a carbon-containing carbon undercoat film2formed thereon, and a perpendicular magnetic film3, in which most of easy-magnetization axes are oriented vertically with respect to the substrate, formed on the undercoat film. The perpendicular magnetic film is formed through a plurality of sputtering operations using at least one element selected from Pt and Pd and through a plurality of sputtering operations using a Co-containing material.
REFERENCES:
patent: 5792564 (1998-08-01), Hikosaka et al.
patent: 5830569 (1998-11-01), Hikosaka et al.
patent: 6524730 (2003-02-01), Chen
patent: 2002/0004148 (2002-01-01), Shimizu et al.
patent: 6-111403 (1994-04-01), None
patent: 8-30951 (1996-02-01), None
patent: 08-030951 (1996-02-01), None
Translation of JP08-030951.
Osaka Tetsuya
Sakai Hiroshi
Rickman Holly
Showa Denko Kabushiki Kaisha
Sughrue & Mion, PLLC
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