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:
May. 12, 2015
Filed:
Feb. 06, 2014
Hgst Netherlands B.v., Amsterdam, NL;
Patrick M. Braganca, San Jose, CA (US);
Samir Y. Garzon, Sunnyvale, CA (US);
Bruce A. Gurney, San Jose, CA (US);
Keyu Pi, San Jose, CA (US);
Rehan A. Zakai, San Ramon, CA (US);
Jian Zhu, San Jose, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
The embodiments disclosed generally relate to a read device in a magnetic recording head. The read device uses parametric excitation to injection lock the STO to an external AC signal with a frequency that is two times the resonance frequency, or more. The field from the media acting on the STO causes a change in the phase between the STO output and the external locking signal, which can be monitored using a phase detection circuit. The injection locking improves the STO signal to noise ratio and simplifies the detection circuit.