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Spin–Orbit Torques in NbSe/Permalloy Bilayers

Cornell Affiliated Author(s)

Author

Marcos Guimarães
Gregory Stiehl
David MacNeill
Neal Reynolds
Daniel Ralph

Abstract

We present measurements of current-induced spin-orbit torques generated by NbSe2, a fully metallic transition-metal dichalcogenide material, made using the spin-torque ferromagnetic resonance (ST-FMR) technique with NbSe2/Permalloy bilayers. In addition to the out-of-plane Oersted torque expected from current flow in the metallic NbSe2 layer, we also observe an in-plane antidamping torque with torque conductivity σS ? 103 (?/2e)(?m)?1 and indications of a weak field-like contribution to the out-of-plane torque oriented opposite to the Oersted torque. Furthermore, in some samples we also measure an in-plane field-like torque with the form m× ẑ, where mis the Permalloy magnetization direction and ẑ is perpendicular to the sample plane. The size of this component varies strongly between samples and is not correlated with the NbSe2 thickness. A torque of this form is not allowed by the bulk symmetries of NbSe2 but is consistent with symmetry breaking by a uniaxial strain that might result during device fabrication. © 2018 American Chemical Society.

Date Published

Journal

American Chemical Society (ACS)

Volume

18

Issue

2

Number of Pages

1311-1316,

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042134734&doi=10.1021%2facs.nanolett.7b04993&partnerID=40&md5=7d4f53b24872f14090a4b93a12cd71b7

DOI

10.1021/acs.nanolett.7b04993

Funding Source

Rubicon 680-50-1311
1144153
1406333
1542081
1708499
1719875
DMR-1406333
DMR-1708499
W911NF-15-1-0447
DGE-1144153
DMR-1719875
ECCS-1542081

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