Spin Hall magnetoresistance (SMR) has been observed in Pt/NiO/Y3Fe5O12 (YIG)heterostructures with characteristics very different from those in Pt/YIG. Weshow that the SMR in Pt/NiO/YIG strongly correlates with spin conductance, bothsharing very strong temperature dependence due to antiferromagnetic magnons andspin fluctuation. This phenomenon indicates that spin current generated by spinHall effect in the Pt transmits through the insulating NiO and is reflectedfrom the NiO/YIG interface. Inverted SMR has been observed below a temperaturewhich increases with the NiO thickness, suggesting spin-flip reflection fromthe antiferromagnetic NiO exchange coupled with the YIG.
展开▼
