Abstract
Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland Thermoelectric properties of nanoscopic system composed of a single-level quantum dot attached to ferromagnetic electrodes are studied with the use of the non-equilibrium Green function formalism. Electrical and heat currents owing through the system under temperature gradient and bias voltage are calculated in the non-linear regime. Both charge and heat currents strongly depend on con guration of magnetic moments in the leads. TMR ratio is mostly positive, but in a region of small bias voltages, where the electron ow is determined by the temperature gradient, electrical current in parallel and antiparallel con gurations ows in opposite directions leading to considerable negative TMR.
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