The spin Peltier effect (SPE), heat-current generation as a result of spin-current injection, has been investigated in alternately stacked Pt/Fe₃O₄ multilayer films. The temperature modulation induced by the SPE in the [Pt/Fe₃O₄]×n films was found to be significantly enhanced with increasing the number of Pt/Fe₃O₄ bilayers n. This SPE enhancement is much greater than that expected for a simple stack of independent Pt/Fe₃O₄ bilayers. The observed n dependence of the SPE can be explained by introducing spin-current redistribution in the multilayer films in the thickness direction, in a manner similar to the enhancement of the spin Seebeck effect in multilayers.
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Uchida et al. (2017) studied this question.
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