Measurements at 4.2 K. of the magnetoresistance of Co/AgMn, Co/CuMn, Co/AgPt, and (:o/CuPi muitilayers with the current perpendicular to the layer planes (CPP-MR) show effects of reduced spin diA'usion lengths due to alloying of the nonmagnetic metal with impurities that produce spin-spin (Mn) or spin-orbit (Pt) scattering. Combining the data with u theory by Valet and Fert gives the spin diA'usion lengths in the alloys.
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