Garzon Samir, Zutić Igor, Webb Richard A
Department of Physics and Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742, USA.
Phys Rev Lett. 2005 May 6;94(17):176601. doi: 10.1103/PhysRevLett.94.176601. Epub 2005 May 2.
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.
