Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S52: Magnetization and Spin Dynamics III: AF, Ferro-, Ferri-Magnets & High Spin Systems
8:00 AM–10:48 AM,
Thursday, March 17, 2022
Room: McCormick Place W-475A
Sponsoring
Unit:
GMAG
Chair: Satoru Emori, Virginia Tech
Abstract: S52.00007 : Angular Dependence of Spin Torques in Current-in-Plane Exchange-Biased Spin Valves*
9:12 AM–9:24 AM
Presenter:
David A Smith
(Virginia Tech)
Authors:
David A Smith
(Virginia Tech)
Adbhut Gupta
(Virginia Tech)
Yuankai Zheng
(Western Digital)
Zhitao Diao
(Western Digital)
Christian Kaiser
(Western Digital)
Jean J Heremans
(Virginia Tech)
Satoru Emori
(Virginia Tech)
Here, we investigate spin torques in current-in-plane NiFe/Cu/CoFe/IrMn spin valves. The exchange-biased CoFe layer provides the symmetry breaking necessary for unconventional spin torques. By employing spin-torque ferromagnetic resonance, we have measured spin torques in the NiFe free layer magnetized along different directions with respect to the CoFe fixed layer. Our angle-dependent results show expected torques from the Oersted field and spin/anomalous Hall effects, along with an additional torque that cannot be explained by existing predictions. Our work points to the possibility of generating a new family of unconventional torques in spin valves compatible with well-established device fabrication processes.
[1] D. MacNeill, et al., Nat. Phys. 13, 300 (2017)
[2] Y. Hibino, et al., Phys. Rev. B 101, 174441 (2020)
[3] S. C. Baek, et al., Nat. Mater. 17, 509 (2018)
*D. A. S. and S. E. acknowledge support from NSF Grant No. DMR-2003914
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