  We show that in magnetic nanostructures with a homogeneous magnetic order,
the equilibrium spin current can be nonzero. For example, this is the case of a
wide magnetic ring with the magnetization along the ring axis. The physical
reason of this effect is a variation of the orientation of anisotropy axis
inducing a spin torque acting on the magnetic ions. The mechanism of the spin
current generation is related to the quantum vacuum fluctuations in the
magnetic system.
