Phonon driven spin distribution due to the spin-Seebeck effect
  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. 
C. M. Jaworski, J. Yang, S. Mack, D. D. Awschalom, R. C. Myers, J. P.   Heremans
cond-mat.mtrl-sci