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We study room-temperature generation and detection of pure spin currentsusing lateral spin-valve devices with Heusler-compound electrodes, Co$_{2}$FeSi(CFS) or Fe$_{3}$Si (FS). The magnitude of the nonlocal spin-valve (NLSV)signals is seriously affected by the dispersion of the resistivity peculiarlyobserved in the low-temperature grown Heusler compounds with orderedstructures. From the analysis based on the one-dimensional spin diffusionmodel, we find that the spin polarization monotonically increases withdecreasing the resistivity, which depends on the structural ordering, for bothCFS and FS electrodes, and verify that CFS has relatively large spinpolarization compared with FS.

physical review. b, condensed matter and materials physics

Estimation of the spin polarization for Heusler-compound thin films by  means of nonlocal spin-valve measurements: Comparison of Co$_{2}$FeSi and  Fe$_{3}$Si