Spin and charge transport in material with spin-dependent conductivity

The spin and charge transport in materials with spin-dependent conductivity has been studied. It was shown that there is a charge accumulation along spin diffusion in a ferromagnetic metal, which causes a shortening of the spin diffusion length. It was shown that there is a substantial interaction between the drift and diffusion currents in semiconductors. The effects of gain/damping of a spin current by a charge current and the existence of a threshold spin current in a semiconductor were described. Because of the substantial magnitude, these new spintronics effect might be used for new designs of efficient spintronic devices. The influence of a spin drain on spin transport was discussed.