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:
Jan. 12, 2010
Filed:
Sep. 14, 2005
Fumiko Akagi, Tokyo, JP;
Tatsuya Hinoue, Kanagawa, JP;
Atsushi Nakamura, Tokyo, JP;
Tomoo Yamamoto, Kanagawa, JP;
Fumiko Akagi, Tokyo, JP;
Tatsuya Hinoue, Kanagawa, JP;
Atsushi Nakamura, Tokyo, JP;
Tomoo Yamamoto, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
An AFC magnetic recording medium having a three-layered ferromagnetic structure capable of reducing noises without deteriorating thermal stability is provided in order to achieve ultra-high recording density. In one embodiment, the AFC magnetic recording medium has a magnetic recording layer formed on a substrate via an underlayer, the magnetic recording medium consisting of a first ferromagnetic layer formed on the underlayer, a second ferromagnetic layer formed on the first ferromagnetic layer via a nonmagnetic layer inducing the antiferromagnetic interaction, and a third ferromagnetic layer formed on the second ferromagnetic layer, wherein the center of gravity G of the magnetic recording medium is defined using the distance tfrom the upper surface of the third ferromagnetic layer as: