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. 21, 2006
Filed:
Nov. 18, 2003
Sining Mao, Savage, MN (US);
Eric S. Linville, Chanhassen, MN (US);
Nurul Amin, Woodbury, MN (US);
Johannes Van Ek, Minnetonka, MN (US);
Olle G. Heinonen, Eden Prairie, MN (US);
Sining Mao, Savage, MN (US);
Eric S. Linville, Chanhassen, MN (US);
Nurul Amin, Woodbury, MN (US);
Johannes Van Ek, Minnetonka, MN (US);
Olle G. Heinonen, Eden Prairie, MN (US);
Seagate Technology LLC, Scott Valley, CA (US);
Abstract
A differential read head comprises one tri-layer reader or a plurality of tri-layer readers operating in a current perpendicular to plane (CPP) mode. The tri-layer readers each comprise a first free layer, a second free layer, and a nonmagnetic layer positioned therebetween. A nonmagnetic spacer is positioned between the plurality of tri-layer readers for electrically connecting the plurality of tri-layer readers in series such that a single CPP sense current representing a differential signal flows serially through the read head. With a single tri-layer reader, the free layers are spaced by a width substantially similar to the transition width of the magnetic medium.