Spin accumulation in the semi classical and quantum regimes

We consider spin accumulation at a ferromagnet-normal metal interface in th e presence of magnetic scattering in the normal metal. In the classical reg ime, we discuss the inverse Drude scaling of the conductance as a function of the interface transparencies. We present a treatment based on an exact s olution of the Boltzmann equation. In the quantum regime, we solve a single impurity "spin-flip Fabry Perot interferometer" for quantum coherent multi ple scatterings, in which we find a resonance in the spin flip channels,Thi s resonance appears to be the quantum analog of the semi classical inverse Drude scaling of the conductance.