Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-03-25
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 10 figures
Scientific paper
10.1103/PhysRevB.60.7385
We analyze the interplay between disorder and band structure in current perpendicular to the planes (CPP) 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. Magneto-transport 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.
Jefferson John H.
Lambert Jean-Charles
Sanvito Stefano
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