The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2007
Filed:
Mar. 31, 2000
Hiroshi Tomiyasu, Tokyo, JP;
Teiichiro Umezawa, Tokyo, JP;
Genshichi Hata, Tokyo, JP;
Takashi Morikawa, Tokyo, JP;
Masato Kobayashi, Tokyo, JP;
Masashi Suzuki, Singapore, SG;
Satoshi Yokota, Singapore, SG;
Tsuyoshi Watanabe, Singapore, SG;
Hiroshi Tomiyasu, Tokyo, JP;
Teiichiro Umezawa, Tokyo, JP;
Genshichi Hata, Tokyo, JP;
Takashi Morikawa, Tokyo, JP;
Masato Kobayashi, Tokyo, JP;
Masashi Suzuki, Singapore, SG;
Satoshi Yokota, Singapore, SG;
Tsuyoshi Watanabe, Singapore, SG;
Hoya Corporation, , JP;
Abstract
There is disclosed a magnetic recording medium in which a seed layer, under layer, intermediate layer, first magnetic layer, nonmagnetic layer, second magnetic layer, protective layer, and lubricant layer are successively laminated on a glass substrate, the nonmagnetic layer is constituted of an alloy containing Cr and C, and the magnetic layer is constituted of an alloy containing Co and Pt. The under layer includes at least the seed layer for finely dividing the crystal particles of the magnetic layer, the seed layer includes at least two or more layers of nonmagnetic films, and the intermediate layer formed of the material different from that of the nonmagnetic film is interposed between the nonmagnetic films. In measurement of the thermal stability of the magnetic recording medium, a head is used, the head includes a read/write element, and a write track width is twice or more as large as a read track width in the head.