Interfacial origin of unconventional spin-orbit torque in Py/$\gamma -$IrMn${}_3$

Abstract

Angle-resolved spin-torque ferromagnetic resonance measurements are carried out in heterostructures consisting of Py (Ni${}_{81}$Fe${}_{19}$) and a noncollinear antiferromagnetic quantum material $\gamma -$IrMn${}_3$. The structural characterization reveals that $\gamma -$IrMn${}_3$ is polycrystalline in nature. A large exchange bias of 158~Oe is found in Py/$\gamma -$IrMn${}_3$ at room temperature, while $\gamma -$IrMn${}_3$/Py and Py/Cu/$\gamma -$IrMn${}_3$ exhibited no exchange bias. Regardless of the exchange bias and stacking sequence, we observe a substantial unconventional out-of-plane anti-damping torque when $\gamma -$IrMn${}_3$ is in direct contact with Py. The magnitude of the out-of-plane spin-orbit torque efficiency is found to be twice as large as the in-plane spin-orbit torque efficiency. The unconventional spin-orbit torque vanishes when a Cu spacer is introduced between Py and $\gamma -$IrMn${}_3$, indicating that the unconventional spin-orbit torque in this system originates at the interface. These findings are important for realizing efficient antiferromagnet-based spintronic devices via interfacial engineering.

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Cited by in corpus (1)

• Symmetry Enhanced Unconventional Spin Current Anisotropy in a Collinear Antiferromagnet