Independence of spin-orbit torques from the exchange bias direction in Ni${}_{81}$Fe${}_{19}$/IrMn bilayers

Abstract

We investigated a possible correlation between spin Hall angles and exchange bias in Ni${}_{81}$Fe${}_{19}$/IrMn samples by performing spin torque ferromagnetic resonance measurements. This correlation is probed by patterning of Ni${}_{81}$Fe${}_{19}$/IrMn bilayers in different relative orientations with respect to the exchange bias direction. The measured voltage spectra allow a quantitative determination of spin Hall angles, which are independent of the orientation around 2.8\pm0.3%.

arXiv comment10 pages

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• Charge-spin current conversion in high quality epitaxial Fe/Pt systems: isotropic spin Hall angle along different in-plane crystalline directions
• Influence of Atomic Roughness at The Uncompensated Fe/CoO (111) Interface on Exchange Bias Effect
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• Interfacial origin of unconventional spin-orbit torque in Py/$\gamma -$IrMn${}_3$
• Spin decoherence independent of antiferromagnetic order in IrMn
• RF field characterization and rectification effects in spin pumping and spin-torque FMR for spin-orbitronics