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:
Sep. 02, 2008
Filed:
Aug. 31, 2004
Xiaoping Bian, San Jose, CA (US);
Mary Frances Doerner, Santa Cruz, CA (US);
Tetsuya Kanbe, Cupertino, CA (US);
Mark Mercado, Morgan Hill, CA (US);
Mohammad Mirzamaani, San Jose, CA (US);
Adam Polcyn, San Jose, CA (US);
Kai Tang, San Jose, CA (US);
Xiaoping Bian, San Jose, CA (US);
Mary Frances Doerner, Santa Cruz, CA (US);
Tetsuya Kanbe, Cupertino, CA (US);
Mark Mercado, Morgan Hill, CA (US);
Mohammad Mirzamaani, San Jose, CA (US);
Adam Polcyn, San Jose, CA (US);
Kai Tang, San Jose, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
An antiferromagnetically coupled (AFC) magnetic recording medium with an AFC master layer comprising at least two magnetic layers with the top magnetic layer including copper is described. The slave layer is separated from the master layer structure by a nonmagnetic spacer layer selected to antiferromagnetically couple the layers. The master layer structure according to the invention includes a bottom and top layer of distinct ferromagnetic materials. Preferably, the top layer of the master layer is a cobalt alloy including from 1 to 5 at. % copper with an example being CoPtCrBCu. The AFC magnetic layer structure can be used with a variety of substrates including circumferentially textured glass and NiP/AlMg.