Magnetic disk with specified contact ratio [BH 1.0 nm] and...

Details Magnetic disk with specified contact ratio [BH 1.0 nm] and... Magnetic disk with specified contact ratio [BH 1.0 nm] and...

2007-07-03

2007-07-03

Bernatz, Kevin M. (Department: 1773)

Dynamic magnetic information storage or retrieval

Record medium

Disk

C428S848200

Reexamination Certificate

active

10926395

ABSTRACT:
A texture processing for imparting a magnetic orientation in the circumferential direction is applied to a substrate so as to impart a magnetic anisotropy to the magnetic disk in the circumferential direction. An underlying film, a magnetic recording film, a protective film, and a lubricating film are laminated one upon the other on the surface of the substrate. The surface of the magnetic disk has a value of the contact ratio [BH 1.0 nm] falling within a range of 7% to 15% in a region having a height not smaller than 1.0 nm, based on the height at which the contact ratio in the bearing curve of a surface roughness is 50%.

REFERENCES:
patent: 6475599 (2002-11-01), Saito et al.
patent: 6509111 (2003-01-01), Shoda et al.
patent: 6852432 (2005-02-01), Shoda et al.
patent: 2006/0194080 (2006-08-01), Ishii et al.
patent: 2001-143246 (2001-05-01), None
patent: 2001-160214 (2001-06-01), None

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