Magnetotransport properties of CoFeB and Co/Ru interfaces in the current-perpendicular-to-plane geometry

We have investigated magnetotransport properties of CoFeB and Co/Ru interfaces by measuring the magnetoresistances of sputtered CoFeB-based exchange-biased spin valves and Co/Ru multilayers on the first antiferromagnetic coupling peak at 4.2 K in the current-perpendicular-to-plane geometry. The spin diffusion length l(sf) and the spin-scattering asymmetry beta of Co40Fe40B20 and Co56Fe24B20 are estimated, and the interface specific resistance 2AR(*) and the interfacial spin-scattering anisotropy gamma of Co/Ru interfaces are constrained. (c) 2008 American Institute of Physics.