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. 17, 2005
Filed:
May. 20, 2003
Gerardo Bertero, Redwood City, CA (US);
David Wachenschwanz, Saratoga, CA (US);
Sudhir Malhotra, Fremont, CA (US);
Emur M. Velu, Fremont, CA (US);
Gerardo Bertero, Redwood City, CA (US);
David Wachenschwanz, Saratoga, CA (US);
Sudhir Malhotra, Fremont, CA (US);
Emur M. Velu, Fremont, CA (US);
Komag, Inc., San Jose, CA (US);
Abstract
A perpendicular magnetic recording disk having a soft magnetic film disposed between a substrate and a magnetic recording layer. The soft magnetic film includes a soft magnetic underlayer and one or more layer groups having a spacer layer and a soft magnetic layer disposed above the spacer layer in each layer group. The spacer layers induce anti-ferromagnetic coupling between the surrounding ferromagnetic layers. The spacer layers may be comprised of ruthenium. The soft magnetic layers may have a granular decoupled structured through the use of a segregate.