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We report nonlocal spin injection and detection experiments on mesoscopicCo-Al2O3-Cu spin valves. We have observed a temperature dependent asymmetry inthe nonlocal resistance between parallel and antiparallel configurations of themagnetic injector and detector. This strongly supports the existence of anonequilibrium resistance that depends on the relative orientation of thedetector magnetization and the nonequilibrium magnetization in the normal metalproviding evidence for increasing interface spin scattering with temperature.Comment: 5 pages, 4 figures, accepted for publication in PRL, minor  corrections (affiliation, acknowledgements, typo

Temperature-Dependent Asymmetry of the Nonlocal Spin-Injection Resistance: Evidence for Spin Nonconserving Interface Scattering