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:
Mar. 22, 2011
Filed:
Mar. 23, 2007
Hai Jiang, Fremont, CA (US);
Kyusik Sin, Pleasanton, CA (US);
Hai Jiang, Fremont, CA (US);
Kyusik Sin, Pleasanton, CA (US);
Western Digital (Fremont), LLC, Fremont, CA (US);
Abstract
The method and system for providing a perpendicular magnetic recording (PMR) head are described. The method and system include providing a metal underlayer and a PMR pole on the metal underlayer. The metal underlayer is amorphous. The PMR pole has a bottom and a top wider than the bottom. The PMR pole includes at least a first ferromagnetic layer, a second ferromagnetic layer, and a third ferromagnetic layer. The first ferromagnetic layer is antiferromagnetically coupled with the second ferromagnetic layer. The second ferromagnetic layer is antiferromagnetically coupled with the third ferromagnetic layer.