3 years ago

Spin–Orbit Torques in NbSe2/Permalloy Bilayers

Spin–Orbit Torques in NbSe2/Permalloy
Gregory M. Stiehl, Neal D. Reynolds, Marcos H. D. Guimarães, David MacNeill, Daniel C. Ralph
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 (ℏ/2e)(Ωm)−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 m̂ × ẑ, where m̂ is 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.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b04993

DOI: 10.1021/acs.nanolett.7b04993

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