Gigantic enhancement of spin Seebeck effect by phonon drag

Details Gigantic enhancement of spin Seebeck effect by phonon drag Gigantic enhancement of spin Seebeck effect by phonon drag

2010-10-22

arxiv.org/abs/1010.4600v2

Appl. Phys. Lett. 97, 252506 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

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.

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