Electronic Correlations in Transport Through Magnetic Nano structures

The coherent electronic transport through a quantum dot coupled to ferromagnetic electrodes is calculated for the parallel and antiparallel orientations of polarizations. The influence on transport of both the charge fluctuations and the Kondo resonance are considered by using the equation of motion method for the non-equilibrium Green functions. The largest spin accumulation is observed in mixed valence range. In Kondo regime the state of a particle is a singlet for any polarization of the leads. (author)