  We investigate the spin Seebeck effect and spin pumping in a junction between
a ferromagnetic insulator and a magnetic impurity deposited on a normal metal.
By the numerical renormalization group calculation, we show that spin current
is enhanced by the Kondo effect. This spin current is suppressed by increase of
the temperature or the magnetic field which is comparable with the Kondo
temperature. Our results indicate that spin transport can be a direct probe of
spin excitation in strongly correlated systems.
