Abstract
Spin polarized transport through a quantum dot coupled to two ferromagnetic leads is analyzed theoretically by the non-equilibrium Green function technique. The relevant correlation and retarded (advanced) Green functions have been calculated within a consistent approach in the Hartree-Fock approximation. Magnetic configuration of the system can vary continuously from parallel to antiparallel alignment of the electrode magnetizations. When coupling of the dot to the leads is spin dependent, transport characteristics depend on the angle between magnetic moments of the leads. Nonlinear transport characteristics, including conductance, differential conductance and tunnel magnetoresistance have been analyzed numerically.
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