Spin-Orbit Torques in NbSe<sub>2</sub>/Permalloy Bilayers.
basic_science · Level V
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- Record sourced from PubMed, PMID 29328662.
- Also identified by DOI 10.1021/acs.nanolett.7b04993.
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Abstract
We present measurements of current-induced spin-orbit torques generated by NbSe<sub>2</sub>, a fully metallic transition-metal dichalcogenide material, made using the spin-torque ferromagnetic resonance (ST-FMR) technique with NbSe<sub>2</sub>/Permalloy bilayers. In addition to the out-of-plane Oersted torque expected from current flow in the metallic NbSe<sub>2</sub> layer, we also observe an in-plane antidamping torque with torque conductivity σ<sub>S</sub> ≈ 10<sup>3</sup> (ℏ/2e)(Ωm)<sup>-1</sup> 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 NbSe<sub>2</sub> thickness. A torque of this form is not allowed by the bulk symmetries of NbSe<sub>2</sub> but is consistent with symmetry breaking by a uniaxial strain that might result during device fabrication.