Phonon driven spin distribution due to the spin-Seebeck effect

Details Phonon driven spin distribution due to the spin-Seebeck effect Phonon driven spin distribution due to the spin-Seebeck effect

2011-02-04

arxiv.org/abs/1102.1024v1

Phys. Rev. Lett. 106, 186601 (2011)

Physics

Condensed Matter

Materials Science

12 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.106.186601

Here we report on measurements of the spin-Seebeck effect of GaMnAs over an extended temperature range alongside the thermal conductivity, specific heat, magnetization, and thermoelectric power. The amplitude of the spin-Seebeck effect in GaMnAs scales with the thermal conductivity of the GaAs substrate and the phonon-drag contribution to the thermoelectric power of the GaMnAs, demonstrating that phonons drive the spin redistribution. A phenomenological model involving phonon-magnon drag explains the spatial and temperature dependence of the measured spin distribution.

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