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. 06, 2017
Filed:
Jun. 21, 2016
Hgst Netherlands B.v., Amsterdam, NL;
Hideaki Tanaka, Odawara, JP;
Katsuro Watanabe, Hitachiota, JP;
Shigeru Tadokoro, Odawara, JP;
Wataru Kimura, Fujisawa, JP;
Yohji Maruyama, Iruma, JP;
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
The MAMR head comprises a main pole, a spin torque oscillator (STO) positioned over the main pole, and write coils coupled to the main pole. The STO generates a high frequency magnetic field on a magnetic medium. The controller is configured to supply the STO with first bias current at a first bias current level, and further supply the STO with second bias current at a second bias current level. The controller is further configured to time the second bias current to coincide with an electrical current overshoot in the write coils.