Anomalous Hall effect and spin orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of antiferromagnet

摘要

We report systematic measurements of anomalous Hall effect(AHE) and spinorbit torques(SOT) in MnGa/IrMn films,, in which a single MnGa epitaxial layerreveals obvious orbital two-channel Kondo (2CK) effect. As increasing thethickness of the antiferromagnet IrMn, the strong spin Hall effect(SHE)hasgradually suppressed the orbital 2CK effect and modified the AHE of MnGa.Ascaling involving multiple competing scattering mechanisms has been used todistinguish different contributions to the modified AHE. Finally, the sizeableSOT in the MnGa/IrMn films induced by the strong SHE of IrMn have beeninvestigated.The IrMn layer also supplies an in-plane exchange bias field andenables nearly field-free magnetization reversal.