Gigantic enhancement of spin Seebeck effect by phonon drag

Abstract

We investigate both theoretically and experimentally a gigantic enhancement of the spin Seebeck effect in a prototypical magnet LaY${}_2$Fe${}_5$O${}_{12}$ at low temperatures. Our theoretical analysis sheds light on the important role of phonons; the spin Seebeck effect is enormously enhanced by nonequilibrium phonons that drag the low-lying spin excitations. We further argue that this scenario gives a clue to understand the observation of the spin Seebeck effect that is unaccompanied by a global spin current, and predict that the substrate condition affects the observed signal.

5 pages, 4 figures

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• Spin Seebeck insulator
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Theory of magnon-driven spin Seebeck effect
• Evolution of the spin Hall effect in Pt nanowires: Size and temperature effects
• Gigantic enhancement of spin Seebeck effect by phonon drag

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