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:
Jun. 09, 2020
Filed:
Feb. 15, 2019
Western Digital Technologies, Inc., San Jose, CA (US);
Zhigang Bai, Fremont, CA (US);
Venkatesh Chembrolu, Fremont, CA (US);
Yaguang Wei, Pleasanton, CA (US);
Terence Lam, Cupertino, CA (US);
Michael Kuok San Ho, Emerald Hills, CA (US);
Lijie Guan, San Jose, CA (US);
Suping Song, Fremont, CA (US);
Supradeep Narayana, Santa Clara, CA (US);
WESTERN DIGITAL TECHNOLOGIES, INC., San Jose, CA (US);
Abstract
A current-assisted magnetic recording write head has an electrically conductive layer in the write gap between the write pole and the trailing shield. Electrical circuitry directs current from the write pole, through the conductive layer, to the trailing shield. The current through the conductive layer generates an Ampere field substantially orthogonal to the magnetization in the write pole to assist magnetization switching of the write pole. The write head's magnetic throat height (TH) is substantially the thickness of the trailing shield at the write gap, while the write head's electrical throat height (TH) is substantially the height of the conductive layer in the write gap. In embodiments of this invention, the signal-to-noise ratio (SNR) of the readback signal and the soft error rate (SER) of the recorded data can be improved with a write gap structure wherein THis greater than TH.