Nature of magnetotransport in metal/insulating-ferromagnet heterostructures: Spin Hall magnetoresistance or magnetic proximity effect

TL;DR

This study investigates the magnetotransport phenomena in metal/insulating-ferromagnet heterostructures, revealing how spin Hall magnetoresistance and magnetic proximity effects influence anomalous Hall-like effects and anisotropic magnetoresistance.

Contribution

It demonstrates how the sign changes of resistivities with temperature can be used to distinguish between spin Hall magnetoresistance and magnetic proximity effects in heterostructures.

Findings

EAMR and AHLE resistivities change sign with temperature in {b3}-IrMn3/YIG due to competing effects.

In Pt/YIG, only AHLE resistivity changes sign, indicating different dominant mechanisms.

AHLE and EAMR are effective in disentangling MPE and SMR in heterostructures.

Abstract

We study the anomalous Hall-like effect (AHLE) and the effective anisotropic magnetoresistance (EAMR) in antiferromagnetic {\gamma} -IrMn3/Y3Fe5O12(YIG) and Pt/YIG heterostructures. For {\gamma} -IrMn3/YIG, the EAMR and the AHLE resistivity change sign with temperature due to the competition between the spin Hall magnetoresistance (SMR) and the magnetic proximity effect (MPE) induced by the interfacial antiferromagnetic uncompensated magnetic moment. In contrast, for Pt/YIG the AHLE resistivity changes sign with temperature whereas no sign change is observed in the EAMR. This is because the MPE and the SMR play a dominant role in the AHLE and the EAMR, respectively. As new types of galvanomagnetic property, the AHLE and the EAMR have proved vital in disentangling the MPE and the SMR in metal/insulating-ferromagnet heterostructures.