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 Ni81Fe19/IrMn samples by performing spin torque ferromagnetic resonance measurements. This correlation is probed by patterning of Ni81Fe19/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±0.3%.
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Hilal Saglam, J. Rojas-Sanchez, Sébastien Petit, Michel Hehn, Wei Zhang, et al.. Independence of spin-orbit torques from the exchange bias direction in Ni 81 Fe 19 /IrMn bilayers. Physical Review B : Condensed matter and materials physics, American Physical Society, 2018, 98, pp.094407. ⟨10.1103/PhysRevB.98.094407⟩. ⟨hal-02086049⟩

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