Current-Induced Torques with Dresselhaus Symmetry Due to Resistance Anisotropy in 2D Materials

Abstract

We report measurements of current-induced torques in heterostructures of Permalloy (Py) with TaTe${}_2$, a transition-metal dichalcogenide (TMD) material possessing low crystal symmetry, and observe a torque component with Dresselhaus symmetry. We suggest that the dominant mechanism for this Dresselhaus component is not a spin-orbit torque, but rather the Oersted field arising from a component of current that flows perpendicular to the applied voltage due to resistance anisotropy within the TaTe${}_2$. This type of transverse current is not present in wires made from a single uniform layer of a material with resistance anisotropy, but will result whenever a material with resistance anisotropy is integrated into a heterostructure with materials having different resistivities, thereby producing a spatially non-uniform pattern of current flow. This effect will therefore influence measurements in a wide variety of heterostructures incorporating 2D TMD materials and other materials with low crystal symmetries.

References in corpus (4)

• Nanosecond-timescale low error switching of in-plane magnetic tunnel junctions through dynamic Oersted-field assisted spin-Hall effect
• Thickness dependence of spin-orbit torques generated by WTe2
• Spin-orbit torques in NbSe${}_2$/Permalloy bilayers
• Disentangling relativistic spin torques in a ferromagnet/semiconductor bilayer

Cited by in corpus (4)

• Control of spin-orbit torques by interface engineering in topological insulator heterostructures
• Unconventional spin-orbit torque in transition metal dichalcogenide/ferromagnet bilayers from first-principles calculations
• Large interfacial spin-orbit torques in layered antiferromagnetic insulator NiPS${}_3$/ferromagnet bilayers
• Staggered spin Hall conductivity