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The behavior of spin propagation in metals in various measurement schemes isshown to be qualitatively different than a simple exponential decay - due tothe backflow effect on spin diffusion in the presence of interfaces. To probethis effect we utilize the spin sensitivity of an Andreev contact between goldfilms of variable thickness deposited on top of a spin injector,Co$_{2}$Mn$_{0.5}$Fe$_{0.5}$Si, with the spin polarization of approximately45\%, and Nb superconducting tip. While the results are consistent withgradually decaying spin polarization as the film thickness increases, the spindiffusion length in Au found to be 285 nm, is more than two times larger thatone would have obtained without taking the backflow effect into account.

Backflow Effect on Spin Diffusion Near Ferromagnet-Superconductor Interface