  Spin accumulation and spin transfer torques induced by Spin Hall Effect in
bi-layer structures comprising ferromagnetic and paramagnetic materials are
theoretically investigated. The charge and spin diffusion equations taking into
account spin-flip and spin Hall effect are formulated and solved analytically
and numerically for in structures with simplified and complex geometry,
respectively. It is demonstrated that spin torques could be efficiently
produced by means of Spin Hall effect which may be further enhanced by
modifying structure geometry.
