Аннотация:The spin diffusion and charge equations in Levy-Fert and Waintal models were
numerically solved, using finite element method in complex non-collinear geometry with strongly
inhomogeneous current flow. As an illustration, spin-dependent transport through a magnetic pillar
and nonmagnetic spacer separating two magnetic layers was investigated. It is shown, that the
structure with number of pillars gives a higher value of Giant Magnetoresistance (GMR) effect
rather than a structure with one pillar of equivalent diameter. The inhomogeneity of spin currents,
which has one of the strongest impacts on GMR effect value leads to the occurrence of spin-current
vortices. Introduction of lT and lL lengths in Waintal model gives a better description of angular
dependence of GMR effect rather than Levy-Fert model.