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Spin-to-heat current conversion effects have been investigated in bilayerfilms consisting of a paramagnetic metal (PM; Pt, W, or Ta) and a ferromagneticmetal (FM; CoFeB or permalloy). When a charge current is applied to the PM/FMbilayer film, a spin current is generated across the PM/FM interface owing tothe spin Hall effect in PM. The spin current was found to exhibit cooling andheating features depending on the sign of the spin Hall angle of PM, where thespin-current-induced contribution is estimated by subtracting the contributionof the anomalous Ettingshausen effect in FM monolayer films. We also found thatthe magnitude of the spin-current-induced temperature modulation in thePt/CoFeB film is greater than but comparable to that in the Pt/permalloy film,although the spin dependence of the Peltier coefficient for CoFeB is expectedto be greater than that for permalloy. We discuss the origin of the observedbehaviors with the aid of model calculations; the signals in the PM/FM filmsmay contain the contributions not only from the electron-driven spin-dependentPeltier effect but also from the magnon-driven spin Peltier effect.

Thermographic measurements of spin-current-induced temperature modulation in metallic bilayers