  We analyze transport of magnetization in insulating systems described by a
spin Hamiltonian. The magnetization current through a quasi one-dimensional
magnetic wire of finite length suspended between two bulk magnets is determined
by the spin conductance which remains finite in the ballistic limit due to
contact resistance. For ferromagnetic systems, magnetization transport can be
viewed as transmission of magnons and the spin conductance depends on the
temperature T. For antiferromagnetic isotropic spin-1/2 chains, the spin
conductance is quantized in units of order $(g \mu_B)^2/h$ at T=0.
Magnetization currents produce an electric field and hence can be measured
directly. For magnetization transport in electric fields phenomena analogous to
the Hall effect emerge.
