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:
Nov. 06, 2007
Filed:
Feb. 27, 2004
Kroum S. Stoev, Fremont, CA (US);
Francis H. Liu, Fremont, CA (US);
James H. Wang, Mission Viejo, CA (US);
Marcos M. Lederman, San Francisco, CA (US);
David J. Seagle, Morgan Hill, CA (US);
Kroum S. Stoev, Fremont, CA (US);
Francis H. Liu, Fremont, CA (US);
James H. Wang, Mission Viejo, CA (US);
Marcos M. Lederman, San Francisco, CA (US);
David J. Seagle, Morgan Hill, CA (US);
Western Digital (Fremont), LLC, Fremont, CA (US);
Abstract
A magnetic head for a disk drive is disclosed that has a first soft magnetic pole layer disposed in the head adjacent to a medium-facing surface and extending perpendicular to the medium-facing surface; a second soft magnetic pole layer disposed closer than the first pole layer to the trailing end, the second pole layer magnetically coupled to the first pole layer in a backgap region; a soft magnetic pedestal adjoining the second pole layer, disposed closer than the second pole layer to the medium-facing surface and extending less than the second pole layer extends from the medium-facing surface, the pedestal separated from the first pole layer by a nonferromagnetic gap, the pedestal having a thickness that is less than four hundred and fifty nanometers between the gap and the second pole layer. Longitudinal and perpendicular recording embodiments are disclosed, as well as solenoidal, single-layer and dual-layer reversed-current coil structures.