US 11,682,420 B2
Seed layer for spin torque oscillator in microwave assisted magnetic recording device
James Mac Freitag, Sunnyvale, CA (US); Zheng Gao, San Jose, CA (US); Susumu Okamura, San Jose, CA (US); and Brian R. York, San Jose, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Aug. 31, 2021, as Appl. No. 17/463,358.
Application 17/463,358 is a continuation of application No. 16/450,857, filed on Jun. 24, 2019, granted, now 11,127,420.
Claims priority of provisional application 62/727,814, filed on Sep. 6, 2018.
Prior Publication US 2021/0390977 A1, Dec. 16, 2021
Int. Cl. G11B 5/31 (2006.01); G11B 11/105 (2006.01); H01F 10/30 (2006.01); H01F 10/32 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/314 (2013.01) [G11B 11/10539 (2013.01); G11B 2005/0024 (2013.01); H01F 10/30 (2013.01); H01F 10/329 (2013.01); Y10T 428/11 (2015.01); Y10T 428/1193 (2015.01)] 19 Claims
OG exemplary drawing
 
1. A magnetic recording head, comprising:
a main pole; and
a spin torque oscillator (STO), comprising:
a seed layer comprising a template layer and a damping reduction layer over the template layer, the template layer being disposed in contact with the main pole and the damping reduction layer, wherein the template layer comprises ruthenium or a ruthenium alloy, and wherein the damping reduction layer comprising a nickel aluminum alloy;
a spin polarization layer over the damping reduction layer;
a spacer layer over the spin polarization layer; and
a field generation layer over the spacer layer.