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:
Jun. 09, 2015
Filed:
Jan. 06, 2012
Amarendra Kumar Singh, Singapore, SG;
Shun Matsumoto, Singapore, SG;
Xiao Dong Chen, Singapore, SG;
Hiroshi Kanazawa, Singapore, SG;
Amarendra Kumar Singh, Singapore, SG;
Shun Matsumoto, Singapore, SG;
Xiao Dong Chen, Singapore, SG;
Hiroshi Kanazawa, Singapore, SG;
Showa Denko HD Singapore Pte Ltd., Singapore, SG;
Abstract
A method of forming a perpendicular magnetic recording medium. The perpendicular magnetic recording medium comprises a substrate, an underlayer on the substrate, an intermediate layer on the underlayer and a recording layer on the intermediate layer. The underlayer comprises a first soft underlayer, an antiferromagnetically coupled Ru layer on the first soft underlayer, a second soft underlayer on the antiferromagnetically coupled Ru layer, and an orientation control layer on the second soft underlayer, the method comprises applying a negative bias voltage to the substrate during formation of the underlayer.