Spin-Dependent Transport and Densities of States in Non-collinear Magnetic Barriers

The spin-dependent transport properties in the non-collinear pattern of series of δ-magnetic barriers are studied by using scattering theory and Green's function methods. The Green'sfunction is obtained by using distorted wave approach and the scatteringmatrix is related by Fisher-Lee relationship. In additionto reproducing the results of Papp's and Xu's in parallel and antiparallelconfigurations, we also obtain further results, where arbitrary orientations of the magnetic barriers and arbitrary number of barriers are included. The main finding of our results is that thesigns of polarizations can be switched around some “geometric unpolarized windows”. The well-known antiparallelconfiguration has no such characteristics. Furthermore,we discuss spin-related partial densities of states in bothpolarized and unpolarized structures.