  We show that the injection of a pure spin current (not accompanied by charge
current) into a ring can induce a circulating charge current in the ring,
provided that transport coefficients of the ring are spin-dependent and
inhomogeneous. As an example, we consider a hybrid ferromagnet(F)-normal
metal(N) ring system and calculate the magnitude of the charge current induced
by the pure spin current injection. This phenomenon may have relevance for
spintronic applications.
