Two-component interference effect: Model of a spin-polarized transport

The effect of spin-involved interaction on the transport properties of disordered two-dimensional electron systems with ferromagnetic contacts is described using a two-component model. Components representing spin-up and spin-down states are supposed to be coupled at a discrete set of points. We have found that due to the additional interference arising in two-component systems the difference between conductances fur the parallel and antiparallel orientations of the contact magnetization changes its sign as a function of the length of the conducting channel.