  We present a theory of the Seebeck effect in nanomagnets with dimensions
smaller than the spin diffusion length, showing that the spin accumulation
generated by a temperature gradient strongly affects the thermopower. We also
identify a correction arising from the transverse temperature gradient induced
by the anomalous Ettingshausen effect and an induced spin-heat accumulation
gradient. The relevance of these effects for nanoscale magnets is illustrated
by ab initio calculations on dilute magnetic alloys.
