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:
Apr. 06, 2010
Filed:
Apr. 21, 2006
Michael Zyee-shan Wu, San Jose, CA (US);
Mason LU, Fremont, CA (US);
Kueir W. Chour, San Jose, CA (US);
Connie C. Liu, San Jose, CA (US);
Edward T. Yen, San Jose, CA (US);
Lynn LI, Chanhassen, MN (US);
Steve Hwang, San Jose, CA (US);
Michael Zyee-Shan Wu, San Jose, CA (US);
Mason Lu, Fremont, CA (US);
Kueir W. Chour, San Jose, CA (US);
Connie C. Liu, San Jose, CA (US);
Edward T. Yen, San Jose, CA (US);
Lynn Li, Chanhassen, MN (US);
Steve Hwang, San Jose, CA (US);
Seagate Technology LLC, Scotts Valley, unknown;
Abstract
A corrosion-resistant granular magnetic recording medium with improved recording performance comprises a non-magnetic substrate having a surface; and a layer stack on the substrate surface, including, in order from the surface: a granular magnetic recording layer; an intermediate magnetic de-coupling layer; and a corrosion preventing magnetic cap layer. The intermediate magnetic de-coupling layer has an optimal thickness and/or composition for: (1) promoting magnetic exchange de-coupling between the granular magnetic recording layer and the magnetic cap layer; and (2) reducing the dynamic closure field (H) for determining writeability and eraseability of the medium. Grain boundaries of the magnetic cap layer are substantially oxide-free, and have a greater density and lower average porosity and surface roughness than those of the granular magnetic recording layer.