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Updated: Feb 15, 2026

Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Spin-Orbit Torques in NbSe₂/Permalloy Bilayers.

Marcos H D Guimarães^1,2, Gregory M Stiehl¹, David MacNeill¹

¹Laboratory of Atomic and Solid State Physics, Cornell University , 142 Sciences Drive, Ithaca, New York 14853, United States.

|January 13, 2018

Summary

This summary is machine-generated.

We measured spin-orbit torques from NbSe2, a metallic material, using spin-torque ferromagnetic resonance. We observed both expected and novel in-plane torques, suggesting strain effects influence device behavior.

Keywords:

2D materials Transition metal dichalcogenides spin−orbit coupling spin−orbit torque van der Waals materials

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Last Updated: Feb 15, 2026

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Spin-orbit torques are crucial for next-generation memory and logic devices.
Transition-metal dichalcogenides (TMDs) are promising materials for spintronic applications.
Understanding torque generation mechanisms in novel materials like NbSe2 is essential.

Purpose of the Study:

To investigate current-induced spin-orbit torques generated by NbSe2.
To characterize the nature and magnitude of these torques in NbSe2/Permalloy bilayers.
To explore potential origins of observed torque components, including symmetry considerations.

Main Methods:

Utilized spin-torque ferromagnetic resonance (ST-FMR) technique.
Fabricated NbSe2/Permalloy bilayers for device measurements.
Analyzed torque components including Oersted, antidamping, and field-like torques.

Main Results:

Observed out-of-plane Oersted torque and in-plane antidamping torque with conductivity σS ≈ 10^3 (ℏ/2e)(Ωm)^-1.
Detected a weak out-of-plane field-like torque opposing the Oersted torque.
Measured a sample-dependent in-plane field-like torque, potentially linked to strain-induced symmetry breaking.

Conclusions:

NbSe2 exhibits significant spin-orbit torque properties.
Strain may play a critical role in generating unconventional torques in NbSe2 devices.
Further research is needed to fully elucidate the strain-induced torque mechanisms.