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

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1/09/1999
<mark>Journal</mark>Physical review B
Issue number10
Number of pages10
Pages (from-to)7385-7394
Publication StatusPublished
<mark>Original language</mark>English


We analyze the interplay between disorder and band structure in current perpendicular to the planes giant magnetoresistance (GMR). We consider finite magnetic multilayers attached to pure crystalline leads, described by a tight-binding simple cubic two-band model (s-d). Several models of disorder are considered, including random on-site potentials, lattice distortions, impurities, vacancies, and cross-section fluctuations. Magnetotransport properties are calculated in the zero-temperature zero-bias limit, within the Landauer-Buttiker formalism. Using a very efficient numerical scattering technique, we are able to perform simulations, over large length scales, and to investigate spin transport in the ballistic, diffusive, and localized regimes, as well as the crossover between them. The competition between disorder-induced mean-free-path reduction and disorder-induced spin asymmetry enhancement of the conductance highlights several different regimes of GMR. [S0163-1829(99)01534-9].