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. 08, 2015
Filed:
Jan. 22, 2015
Hgst Netherlands B.v., Amsterdam, NL;
Gunn Choe, San Jose, CA (US);
Yoshihiro Ikeda, San Jose, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A perpendicular magnetic recording media comprises a substrate, a first magnetic oxide layer, a first exchange control layer, a second magnetic oxide layer, a second exchange control layer, and a magnetic cap layer positioned above the substrate, in this order. The first magnetic oxide layer may have an anisotropy energy (Ku) between 6×10and 8×10erg/cm, and a magnetization (Ms) between 600 and 800 emu/cm. The second magnetic oxide layer may have a Ku between 5×10and 8×10erg/cm, and an Ms between 550 and 750 emu/cm. The first exchange control layer may have an Ms between 0 and 100 emu/cm. The second exchange control layer may have an Ms between 0 and 40 emu/cm.