Abstract
The hybrid magnetoresistance (MR) behaviors in Pt/Co90Fe10/Pt, Mn1.5Ga/Pt and Mn1.5Ga/Pt/Co90Fe10/Pt multilayers have been investigated. Both planer Hall effect (PHE) and angle-dependent MR in Pt/Co90Fe10/Pt revealed the combination of spin Hall MR (SMR) and normal anisotropic MR (AMR), indicating the large contribution of strong spin-orbit coupling (SOC) at the interfaces. When Pt contacted with perpendicular magnetic anisotropy (PMA) metal Mn1.5Ga, the strong interfacial SOC modified the effective anomalous Hall effect. The MR in Mn1.5Ga/Pt/Co90Fe10/Pt is not a simple combination of SMR and AMR, but ascribed to the complicated domain wall scattering and strong interfacial SOC when Pt is sandwiched by the in-plane magnetized Co90Fe10 and the PMA Mn1.5Ga.
Highlights
Magnetoresistance (MR) is the property of a material to change the value of its electrical resistance under an external magnetic field
The spin current can be used to apply torque to magnetic moment by direct transfer of spin angular momentum[17,18,19,20]. It can be detected by inverse spin Hall effect (ISHE), which converts the pure spin current into charge current resulting in charge accumulation along the transverse direction
Nakayama et al had presented the unusual MR of Pt/ yttrium iron garnet (YIG) in terms of a nonequilibrium proximity effect caused by the simultaneous action of SHE and ISHE and called it spin Hall MR (SMR)[12]
Summary
Magnetoresistance (MR) is the property of a material to change the value of its electrical resistance under an external magnetic field. The PHE of Pt/CoFe/ Pt is much larger than that of Cu/CoFe/Cu. On the other hand, as compared with normal AMR in Cu/CoFe/ Cu, the angle-dependent MR in Pt/CoFe/Pt reveals that the longitudinal resistivity change is related with the magnetization perpendicular to the current direction in the film plane.
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