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. 26, 2013
Filed:
Feb. 18, 2009
Tatsuya Hinoue, Kanagawa, JP;
Hiroshi Kanai, Kanagawa-ken, JP;
Toshinori Ono, Tokyo, JP;
Hiroyuki Suzuki, Kanagawa, JP;
Hiroshi Inaba, Kanagawa, JP;
Tatsuya Hinoue, Kanagawa, JP;
Hiroshi Kanai, Kanagawa-ken, JP;
Toshinori Ono, Tokyo, JP;
Hiroyuki Suzuki, Kanagawa, JP;
Hiroshi Inaba, Kanagawa, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the present invention produce discrete track media and bit patterned media having both excellent read/write performance and reliability. According to one embodiment, the medium comprises a magnetic layers formed by at least two ferromagnetic alloy layers with different compositions on a substrate. The ferromagnetic alloy layer located closest to the medium surface has more concentrated parts and less concentrated parts of nonmagnetic element in the in-plane direction. The more concentrated parts of the nonmagnetic element contain more nonmagnetic elements than the other parts except for an intermediate layer in the magnetic recording layer. The more concentrated parts and the less concentrated parts of the nonmagnetic element in the ferromagnetic alloy layer located closest to the medium surface are formed substantially concentric. The more concentrated parts of the nonmagnetic element is formed by being doped with ions of nonmagnetic element.