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We perform electronic measurements of unidirectional spin Hallmagnetoresistance (USMR) in a Permalloy/Pt bilayer, in conjunction withmagneto-optical Brillouin light spectroscopy of spin current-driven magnonpopulation. We show that the current dependence of USMR closely follows thedipolar magnon density, and that both dependencies exhibit the same scalingover a large temperature range of 80-400 K. These findings demonstrate a closerelationship between spin current-driven magnon generation and USMR, andindicate that the latter is likely dominated by the dipolar magnons.

Relation between unidirectional spin Hall magnetoresistance and spin current-driven magnon generation