  The spin wave transportation through a transverse magnetic domain wall (DW)
in a magnetic nanowire is studied. It is found that spin wave passes through a
DW without reflection. A magnon, the quantum of the spin wave, carries opposite
spins on the two sides of the DW. As a result, there is a spin angular momentum
transfer from the propagating magnons to the DW. This magnonic spin-transfer
torque can efficiently drive a DW to propagate in the opposite direction to
that of the spin wave.
