US 10,891,975 B1
Magnetic head with assisted magnetic recording and method of making thereof
Zhigang Bai, Fremont, CA (US); Anna Zheng, San Jose, CA (US); Venkatesh Chembrolu, Fremont, CA (US); Supradeep Narayana, Santa Clara, CA (US); Yaguang Wei, Pleasanton, CA (US); Suping Song, Fremont, CA (US); Terence Lam, Cupertino, CA (US); Michael Kuok San Ho, Emerald Hills, CA (US); Changqing Shi, San Ramon, CA (US); Lijie Guan, San Jose, CA (US); and Jian-Gang Zhu, San Jose, CA (US)
Assigned to SanDiskTechnologies LLC., Addison, TX (US)
Filed by SanDisk Technologies LLC, Plano, TX (US)
Filed on Jan. 18, 2019, as Appl. No. 16/252,419.
Claims priority of provisional application 62/743,110, filed on Oct. 9, 2018.
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/115 (2006.01); G11B 5/31 (2006.01)
CPC G11B 5/115 (2013.01) [G11B 5/3116 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A magnetic head, comprising:
a main pole configured to serve as a first electrode;
an upper pole comprising a trailing magnetic shield configured to a serve as a second electrode; and
an electrically conductive portion comprising a multilayer stack located in a trailing gap between the main pole and the trailing magnetic shield;
wherein the electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion comprises at least one first layer comprising an electrically conductive, non-magnetic material and at least one second layer comprising a material different than the at least one first layer, wherein the electrically conductive, non-magnetic material portion is recessed from an air bearing surface (ABS); and
wherein the main pole and the trailing magnetic shield are electrically shorted by the at least one first layer of the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the at least one second layer of the electrically conductive portion.