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:
Feb. 20, 2007
Filed:
Feb. 28, 2000
Min LI, Fremont, CA (US);
Simon H. Liao, Fremont, CA (US);
Cheng T. Horng, San Jose, CA (US);
Kochan Ju, Fremont, CA (US);
Min Li, Fremont, CA (US);
Simon H. Liao, Fremont, CA (US);
Cheng T. Horng, San Jose, CA (US);
Kochan Ju, Fremont, CA (US);
Headway Technologies, Inc., Milpitas, CA (US);
Abstract
A method for forming a laminated shield to improve the stability and performance of an MR read head and the MR read head formed using that shield. The shield consists of two layers of ferromagnetic material separated by a layer of ruthenium, allowing the ferromagnetic layers to form an antiferromagnetic configuration by means of a quantum mechanical exchange interaction. The antiferromagnetic configuration has a stable domain structure and a magnetization that forms closed loops around the shield edges thereby reducing noise in the readback signal and reducing disturbances to the magnetic state of the sensor element.