Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1992-08-07
1994-04-12
Levy, Stuart S.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
360135, 428336, 428652, 428694TS, 428694TR, 428694ST, 428694SG, 428900, 427130, G11B 5704
Patent
active
053024346
ABSTRACT:
A magnetic recording disk based on conventional disk technology has both an extremely smooth top surface and high coercivity, and is incorporated in a contact recording disk file which requires an extremely smooth head-disk interface and a disk with high coercivity. A superfinished untextured NiP coating on a disk substrate is oxidized to form a NiO film. The NiO film permits the subsequently sputter deposited magnetic layer to have much higher coercivity, which enables the disk to be used in contact recording applications. The NiO film and the later deposited layers making up the disk, including the top protective overcoat, conform to the smooth surface of the polished NiP, thus preserving the extremely smooth surface of the top layer of the disk, which is required for the head-disk interface in contact recording disk files. In the preferred process for forming the NiO film on the substrate, the substrate is annealed in air at a temperature below that which would cause the NiP film to crystallize.
REFERENCES:
patent: 4072781 (1978-02-01), Shirahata et al.
patent: 4167765 (1979-09-01), Watrous
patent: 4621030 (1986-11-01), Uesaka et al.
patent: 4696845 (1987-09-01), Yanagisawa
patent: 4849305 (1989-07-01), Yanagisawa
patent: 5041932 (1991-08-01), Hamilton
patent: 5047274 (1991-09-01), Tsuya et al.
Doerner Mary F.
Parker Dan S.
Wu Anthony W.
Yogi Tadashi
Berthold Thomas R.
Ditmyer Paul J.
International Business Machines - Corporation
Levy Stuart S.
LandOfFree
Magnetic recording disk for contact recording does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic recording disk for contact recording, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic recording disk for contact recording will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2097515