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:
Oct. 14, 2014
Filed:
Jan. 10, 2011
Toshiaki Tachibana, Singapore, SG;
Takahiro Onoue, Singapore, SG;
Toshiaki Tachibana, Singapore, SG;
Takahiro Onoue, Singapore, SG;
WD Media (Singapore) Pte. Ltd., Singapore, SG;
Abstract
An object is to provide a perpendicular magnetic recording medium including a ground layer that prevents corrosion, while achieving a primary object of promoting finer magnetic particles of a magnetic recording layer and isolation of these magnetic particles. The structure of a perpendicular magnetic recording mediumaccording to the present invention includes, at least on a base: a magnetic recording layeron which a signal is recorded; a ground layerprovided below the magnetic recording layer; a non-magnetic layerfor controlling crystal orientation of the ground layer; and a soft magnetic layerprovided below the non-magnetic layer. The ground layeris configured to have three layers including, in an order from bottom, a first ground layerand a second ground layerthat contain ruthenium, and a third ground layerthat contains a metal. A gas pressure at film formation by sputtering for the second ground layeris the highest among those for the above three layers.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile