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. 07, 2012
Filed:
Oct. 23, 2007
Tsung Yuan Chen, San Jose, CA (US);
Wen-chien David Hsiao, San Jose, CA (US);
Yimin Hsu, Sunnyvale, CA (US);
Vladimir Nikitin, Campbell, CA (US);
Changqing Shi, Mountain View, CA (US);
Tsung Yuan Chen, San Jose, CA (US);
Wen-Chien David Hsiao, San Jose, CA (US);
Yimin Hsu, Sunnyvale, CA (US);
Vladimir Nikitin, Campbell, CA (US);
Changqing Shi, Mountain View, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
A magnetic write head for perpendicular magnetic data recording having a trailing shield with a two step throat height. The trailing shield is formed over a non-magnetic bump that forms a notch in the leading edge of the trailing shield. This notch defines a first, smaller throat height closest to the write pole and a larger throat height away from the write pole. The smaller throat height near the write pole prevents excess magnetic flux from leaking to the write pole, thereby ensuring efficient strong write field. The larger trailing shield throat height away from the write pole prevents magnetic saturation of the trailing shield and also greatly facilitates manufacturing avoiding problems related to variations and deviations in manufacturing processes used to define the trailing shield.