Spin-transfer mechanism for magnon-drag thermopower
  We point out a relation between the dissipative spin-transfer-torque parameter $\beta$ and the contribution of magnon drag to the thermoelectric power in conducting ferromagnets. Using this result we estimate $\beta$ in iron at low temperatures, where magnon drag is believed to be the dominant contribution to the thermopower. Our results may be used to determine $\beta$ from magnon-drag-thermopower experiments, or, conversely, to infer the strength of magnon drag via experiments on spin transfer. 
M.E. Lucassen, C.H. Wong, R.A. Duine, and Y. Tserkovnyak
cond-mat.mes-hall cond-mat.mtrl-sci