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:
Dec. 20, 2011
Filed:
Nov. 09, 2010
Michael Konrad Grobis, San Jose, CA (US);
Barry Cushing Stipe, San Jose, CA (US);
Dieter K. Weller, San Jose, CA (US);
Gabriel Zeltzer, Mountain View, CA (US);
Michael Konrad Grobis, San Jose, CA (US);
Barry Cushing Stipe, San Jose, CA (US);
Dieter K. Weller, San Jose, CA (US);
Gabriel Zeltzer, Mountain View, CA (US);
Hitachi Global Technologies Netherlands B.V., Amsterdam, NL;
Abstract
A thermally-assisted recording (TAR) patterned-media magnetic recording disk drive has a perpendicular patterned-media disk with multilevel data islands and a laser capable of supplying multiple levels of output power to a near-field transducer (NFT). If there are only two cells in each island, each island is formed of an upper cell of magnetic material with a coercivity Hand a Curie temperature T, a lower cell of magnetic material with a coercivity Hand a Curie temperature Tgreater than T, and a nonmagnetic spacer layer between the two cells. Each cell is formed of high-anisotropy material so as to have an anisotropy field greater than the magnetic write field. The TAR laser is capable of supplying at least two levels of output power to the NFT to allow the islands to be heated to two distinct temperatures so that the two cells in an island can be written so as to have either the same or opposite magnetizations.