Disk substrate for a perpendicular magnetic recording...

Details Disk substrate for a perpendicular magnetic recording... Disk substrate for a perpendicular magnetic recording...

2008-04-15

2008-04-15

Chaney, Carol (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S828000, C428S833200, C427S131000, C360S136000

Reexamination Certificate

active

07357998

ABSTRACT:
A disk substrate for a perpendicular magnetic recording medium comprises a disk base member, a soft magnetic layer formed on the disk base member, and a protection layer formed on the soft magnetic layer. The soft magnetic layer and the protection layer are deposited by sputtering. A perpendicular magnetic recording disk comprises the above-mentioned disk substrate and at least a perpendicular magnetic recording layer formed thereon. The perpendicular magnetic recording layer is deposited on the disk substrate by sputtering after the disk substrate is heated.

REFERENCES:
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patent: 5723198 (1998-03-01), Hosoe et al.
patent: 5851643 (1998-12-01), Honda et al.
patent: 6403203 (2002-06-01), Futamoto et al.
patent: 6511761 (2003-01-01), Tanahashi et al.
patent: 6579634 (2003-06-01), Saito
patent: 2002/0186506 (2002-12-01), Sato et al.
patent: 2003/0099867 (2003-05-01), Nishikawa et al.
patent: 2001-143245 (2001-05-01), None
Translation JP 2001143245.

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