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We have investigated experimentally the non-local voltage signal (NLVS) inthe lateral permalloy (Py)/Cu/Py spin valve devices with different width of Custripes. We found that NLVS strongly depends on the distribution of thespin-polarized current inside Cu strip in the vicinity of the Py-detector. Toexplain these data we have developed a diffusion model describing spatial (3D)distribution of the spin-polarized current in the device. The results of ourcalculations show that NLVS is decreased by factor of 10 due to spinflip-scattering occurring at Py/Cu interface. The interface resistivity onPy/Cu interface is also present, but its contribution to reduction of NLVS isminor. We also found that most of the spin-polarized current is injected withinthe region 30 nm from Py-injector/Cu interface. In the area at Py-detector/Cuinterface, the spin-polarized current is found to flow mainly close on theinjector side, with 1/e exponential decay in the magnitude within the distance80 nm.Comment: 10 pages, 14 figure

physical review. b, condensed matter and materials physics

Current distribution inside<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Py</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow></mml:math>lateral spin-valve devices

Current distribution insidePy∕Culateral spin-valve devices