Spin Injection and Nonlocal Spin Transport in Magnetic Nanostructures

We theoretically study the nonlocal spin transport in a device consisting of a nonmagnetic metal (N) and ferromagnetic injector (F1) and detector (F2) electrodes connected to N. We solve the spin-dependent transport equations in a device with arbitrary interface resistance from a metallic-contact to tunneling regime, and obtain the conditions for efficient spin injection, accumulation, and transport in the device. In a device containing a superconductor (F1/S/F2), the effect of superconductivity on the spin transport is investigated. The spin-current induced spin Hall effect in nonmagnetic metals is also discussed.