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:
Apr. 05, 2005
Filed:
Jan. 18, 2002
Mike Ming Yu Chen, San Mateo, CA (US);
Thomas Edward Dinan, San Jose, CA (US);
Paul Phong Nguyen, San Jose, CA (US);
Neil Leslie Robertson, Palo Alto, CA (US);
Mike Ming Yu Chen, San Mateo, CA (US);
Thomas Edward Dinan, San Jose, CA (US);
Paul Phong Nguyen, San Jose, CA (US);
Neil Leslie Robertson, Palo Alto, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A thin-film write head employing pole pieces formed of an electroplated body-centered cubic (BCC) nickel-iron alloy with a saturation flux density (B) of 1.9 to 2.3 T (19 to 23 kG) and an acceptable coercivity (H) of about 80 to about 160 A/m (1-2 Oe). The iron content of the electroplated nickel-iron alloy is from 64% to 81% by weight. The two-layer pole fabrication process holds magnetic anisotropy and coercivity to useable values while improving saturation flux density and optimizing magnetostriction. This is accomplished by first electroplating a BCC nickel-iron layer onto an underlying seed layer and then annealing the two layers to reduce coercivity to less than about 160 amps/meter and raise magnetization to acceptable levels.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile