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:
Mar. 23, 2021
Filed:
Mar. 29, 2020
Western Digital Technologies, Inc., San Jose, CA (US);
Gonçalo Marcos Baião De Albuquerque, San Jose, CA (US);
Yunfei Ding, Fremont, CA (US);
Alexander Goncharov, Morgan Hill, CA (US);
Kuok San Ho, Redwood City, CA (US);
Daniele Mauri, San Jose, CA (US);
Goran Mihajlovic, San Jose, CA (US);
Suping Song, Fremont, CA (US);
Petrus Antonius Van Der Heijden, Cupertino, CA (US);
Western Digital Technologies, Inc., San Jose, CA (US);
Abstract
Disclosed herein are magnetic recording devices and methods of using them. A magnetic recording device comprises a main pole extending to an air-bearing surface (ABS), a trailing shield extending to the ABS, a write-field-enhancing structure disposed between and coupled to the main pole and the trailing shield at the ABS, a write coil configured to magnetize the main pole, a write current control circuit coupled to the write coil and configured to apply a write current to the write coil, wherein the write current comprises a write pulse, and a bias current control circuit coupled to the write-field-enhancing structure and configured to apply a bias current to the write-field-enhancing structure, wherein the bias current comprises a driving pulse offset in time from the write pulse by a delay, wherein the delay substantially coincides with an expected magnetization switch-time lag of a free layer of the write-field-enhancing structure.