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A novel process of spin conversion from a temperature gradient to atransverse voltage is addressed in this paper, viz. the anomalous Nernst effect(ANE) in a ferromagnetic metal. We report that an additional voltage issuperposed on the conventional anomalous Nernst voltage in FePt crystallinethin films. The dynamics of the local magnetization is modulated by the heatcurrent and excites spin waves. These generate a conduction electron spincurrent via s-d coupling, which flows along the temperature gradient, and thespin current is converted to a Nernst voltage by the inverse spin Hall effect.

Conversion of Heat into Charge Current by the Spin Wave Anomalous Nernst Effect