Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1990-04-24
1993-04-13
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record medium
Disk
428694, 428900, 427128, 427129, 156645, G11B 582, G11B 566, B05D 512, B44C 122
Patent
active
052028100
ABSTRACT:
A magnetic disk includes a non-magnetic substrate with a surface processed layer having fine irregularities formed at least on a main surface thereof, and at least thin film magnetic film and a protective film formed in that order on the non-magnetic substrate in such a manner that the fine irregularities are duplicated thereof. The surface of the surface processed layer of the non-magnetic substrate has protrusions whose surfaces are made flat and a configuration which exhibits a three-dimensional bearing curve in which the bearing ratio at a section taken at a depth from the top of the surface which corresponds to the portion of the top portion deformed by the head load during the contact start-stops drive is between 0.1% and 10%. The protrusions formed on the surface processed layer have a height ranging from several nm to several tens of nm. The bearing ratio is a value obtained at a depth of 5 to 10 nm from the top of the protrusions.
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Kato Yoshiki
Masuda Masami
Nakamura Takao
Ohura Masaki
Okamoto Noriaki
Evans Jefferson
Hitachi , Ltd.
Levy Stuart S.
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