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

TL;DR

This study investigates how the strong spin Hall effect of IrMn influences the anomalous Hall effect and spin orbit torques in MnGa/IrMn films, revealing suppression of the orbital two-channel Kondo effect and enabling field-free magnetization reversal.

Contribution

It demonstrates the modification of AHE and SOT in MnGa/IrMn films due to the strong SHE of IrMn, with insights into the suppression of the orbital 2CK effect.

Findings

Suppression of orbital 2CK effect with increasing IrMn thickness

Enhanced spin orbit torques induced by IrMn's strong SHE

IrMn layer provides in-plane exchange bias enabling field-free magnetization reversal

Abstract

We report systematic measurements of anomalous Hall effect(AHE) and spin orbit torques(SOT) in MnGa/IrMn films,, in which a single MnGa epitaxial layer reveals obvious orbital two-channel Kondo (2CK) effect. As increasing the thickness of the antiferromagnet IrMn, the strong spin Hall effect(SHE)has gradually suppressed the orbital 2CK effect and modified the AHE of MnGa.A scaling involving multiple competing scattering mechanisms has been used to distinguish different contributions to the modified AHE. Finally, the sizeable SOT in the MnGa/IrMn films induced by the strong SHE of IrMn have been investigated.The IrMn layer also supplies an in-plane exchange bias field and enables nearly field-free magnetization reversal.