We consider a nanowire suspended on two spin-polarized leads and subject to a
nonuniform magnetic field. We show that in such a system a temperature drop
between leads can significantly affect the nanowire dynamics. In particular, it
is demonstrated that under certain conditions the stationary distribution of
the mechanical subsystem has Boltzmann form with effective temperature which is
smaller than the temperature of the "cold" lead; this seems rather
counterintuitive. We also find that the change of the direction of the
temperature gradient results in generation of mechanical vibrations rather than
heating of the mechanical subsystem.Comment: 5 pages, 3 figure
