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:
Feb. 27, 2007
Filed:
Feb. 10, 2004
Yoshio Takahashi, Koganei, JP;
Kiwamu Tanahashi, Kokubunji, JP;
Yuzuru Hosoe, Hino, JP;
Ichiro Tamai, Hachioji, JP;
Yoshio Takahashi, Koganei, JP;
Kiwamu Tanahashi, Kokubunji, JP;
Yuzuru Hosoe, Hino, JP;
Ichiro Tamai, Hachioji, JP;
Hitachi Global Storage Technologies Japan, Ltd., Kanagawa-Ken, JP;
Abstract
A magnetic recording medium having a high coercive force and being capable of high-density writing/reading has a substrate, a soft magnetic layer, a non-magnetic intermediate layer, a magnetic layer, a protective layer, and a lubricating layer. The magnetic layer is characterized by stacking fault density and dispersion of particle diameters. The stacking fault density should preferably be no larger than 0.05, and the dispersion of particle diameters should preferably be no larger than 0.4. The magnetic recording medium has a coercive force larger than 4000 Oe, is highly stable to thermal decay, and has a recording density in excess of 50 Gbit/in.