Crossover between ballistic and diffusive regime of the spin-conductance and CPP-GMR in magnetic multilayered nanostructures

Abstract

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.

16 pages, 10 figures

Cited by in corpus (4)

• Asymmetric I-V characteristics and magnetoresistance in magnetic point contacts
• Experimental Evidence for Electron Channelling in Fe/Au (100) Multilayers
• Breakdown of the resistor model of CPP-GMR in magnetic multilayered nanostructures
• Enhancement of GMR due to spin-mixing in magnetic multilayers with a superconducting contact