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:
Sep. 04, 2018
Filed:
Aug. 09, 2016
Western Digital (Fremont), Llc, Fremont, CA (US);
Shaoping Li, San Ramon, CA (US);
Shihai He, Fremont, CA (US);
Gerardo A. Bertero, Redwood City, CA (US);
Ming Mao, Dublin, CA (US);
Yuankai Zheng, Fremont, CA (US);
Anup Ghosh Roy, Fremont, CA (US);
Chen-Jung Chien, Mountain View, CA (US);
Zhihong Zhang, Fremont, CA (US);
Western Digital (Fremont), LLC, Fremont, CA (US);
Abstract
A magnetic read apparatus includes a media-facing surface (MFS), a sensor, a shield structure, a side bias structure, and a shield reference bias structure. The sensor includes a free layer and a nonmagnetic layer. The shield structure includes a shield pinning structure and a shield reference structure between the shield pinning structure and the nonmagnetic layer. The nonmagnetic layer is between the free layer and a shield reference structure. The shield pinning structure includes a pinned moment oriented in a first direction. The shield reference structure includes a reference structure moment weakly coupled with the pinned moment. The side bias structure is adjacent to a side of the free layer and biases the free layer in a first direction parallel to the MFS. The shield reference bias structure is adjacent to the shield reference structure and biases the shield reference structure in a direction opposite to the first direction.