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We analyze the interplay between disorder and band structure in currentperpendicular to the planes (CPP) giant magnetoresistance (GMR). We considerfinite magnetic multilayers attached to pure crystalline leads, described by atight-binding simple cubic two-band model (s-d). Several models of disorder areconsidered, including random on-site potentials, lattice distortions,impurities, vacancies, and cross-section fluctuations. Magneto-transportproperties are calculated in the zero-temperature zero-bias limit, within theLandauer-Buttiker formalism. Using a very efficient numerical scatteringtechnique, we are able to perform simulations, over large length scales, and toinvestigate spin-transport in the ballistic, diffusive and localized regimes,as well as the crossover between them. The competition between disorder-inducedmean free path reduction and disorder-induced spin asymmetry enhancement of theconductance highlights several different regimes of GMR.Comment: 16 pages, 10 figure

Crossover between the ballistic and diffusive regime of the spin-conductance and giant magnetoresistance in magnetic multilayered nanostructures