Temperature dependent asymmetry of the nonlocal spin-injection   resistance: evidence for spin non-conserving interface scattering
  We report nonlocal spin injection and detection experiments on mesoscopic Co-Al2O3-Cu spin valves. We have observed a temperature dependent asymmetry in the nonlocal resistance between parallel and antiparallel configurations of the magnetic injector and detector. This strongly supports the existence of a nonequilibrium resistance that depends on the relative orientation of the detector magnetization and the nonequilibrium magnetization in the normal metal providing evidence for increasing interface spin scattering with temperature. 
Samir Garzon, Igor Zutic, Richard A. Webb