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Influence of external magnetic field on transport properties of a quantum dot attached to non-collinearly polarized magnetic electrodes

Wawrzyniak M

Materials Science Poland

2008

Vol. 26, No. 4

1083--1090

Transport properties of a single level quantum dot attached to non-collinearly polarized magnetic leads and under the influence of external magnetic field have been analyzed theoretically. Description of the considered system has been modeled by the Anderson Hamiltonian with the finite Coulomb repulsion parameter. The analysis has been performed using the equation of motion method for the non-equilibrium Green function within the Hartree-Fock approximation. Numerical illustration of the transport properties such as differential conductance, tunneling magnetoresistance and spin accumulation on the dot under influence of external magnetic field is presented and discussed.

Influence of interface spin-flip processes on spin accumulation and spin currents in magnetic multilayers

Wawrzyniak M., Barnaś J.

Materials Science Poland

2004

Vol. 22, No. 4

537--544

Macroscopic description of electronic transport in magnetic layered structures has been extended by including effects due to spin-flip scattering at interfaces. Such processes lead to spin-memory losses at the interfaces and therefore play a significant role in giant magnetoresistance and spin switching phenomena. They also modify distribution of spin currents, electric fields and spin accumulation in the vicinity of interfaces. A system consisting of two oppositely magnetized semi-infinite ferromagnets, and the case of magnetic/nonmagnetic superlattices in parallel and anti-parallel magnetic configurations are analysed in detail.