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:
Nov. 27, 2012
Filed:
Jul. 21, 2011
Ernesto E. Marinero, Saratoga, CA (US);
Dieter K. Weller, San Jose, CA (US);
Brian R. York, San Jose, CA (US);
Ernesto E. Marinero, Saratoga, CA (US);
Dieter K. Weller, San Jose, CA (US);
Brian R. York, San Jose, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
A patterned perpendicular magnetic recording medium has discrete data islands that have first and second ferromagnetic layers (MAGand MAG) with first and second nonmagnetic interlayers (ILand IL) between MAGand MAG. MAGand MAGmay be similar CoPtCr alloys with similar thicknesses, with thicknesses of ILand ILthat assure that MAGand MAGare strongly exchange coupled. Alternatively, MAGmay be a 'write assist' layer, for example a high-saturation magnetization, magnetically soft material in an exchange-spring structure, with ILbeing very thin so that ILfunctions as the coupling layer between MAGand the write-assist MAGlayer. In an application for thermally-assisted recording (TAR), MAGmay be the chemically-ordered equiatomic binary alloy FePt or CoPt based on the Lphase, with high magneto-crystalline anisotropy (K).