###### Quantum mechanics of spin transfer

Europhysics Letters 79, 67004 (2007)

We consider the interaction of an spin-polarized electron wave packet
with a Heisenberg spin chain. By using a density matrix formulation of
the time-dependent problem, we show how a current interacts with the
spin chain.

If we look only at the first electron, it is possible to increase the
number of spins in the chain and calculate reflectance and
transmittance for each spin component. We show that by tuning the spin
coupling one can switch between spin polarizations of the electon.
(paper in progress)