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Spin Hall magnetoresistance (SMR) and magnon excitation magnetoresistance(MMR) that all generate via the spin Hall effect and inverse spin Hall effectin a nonmagnetic material are always related to each other. However, theinfluence of magnon excitation for SMR is often overlooked due to thenegligible MMR. Here, we investigate the SMR in Pt/Y3Fe5O12 (YIG) bilayers from5 to 300K, in which the YIG are treated after Ar+-ion milling. The SMR in thetreated device is smaller than in the non-treated. According to theoreticalsimulation, we attribute this phenomenon to the reduction of the interfacialspin-mixing conductance at the treated Pt/YIG interface induced by the magnonsuppression. Our experimental results point out that the SMR and the MMR areinter-connected, and the former could be modulated via magnon excitation. Ourfindings provide a new approach for separating and clarifying the underlyingmechanisms.

Spin Hall magnetoresistance in Pt/YIG bilayers via varying magnon excitation