Spin-seebeck effect: a phonon driven spin distribution

Here we report on measurements of the spin-Seebeck effect in 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 subst...

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Bibliographic Details
Published inPhysical review letters Vol. 106; no. 18; p. 186601
Main Authors Jaworski, C M, Yang, J, Mack, S, Awschalom, D D, Myers, R C, Heremans, J P
Format Journal Article
LanguageEnglish
Published United States 02.05.2011
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Summary:Here we report on measurements of the spin-Seebeck effect in 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.
ISSN:1079-7114
DOI:10.1103/physrevlett.106.186601