Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.94: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Tunnel magnetoresistance and spin dependent shot noise in carbon nanotube quantum dot in the Kondo regime — •Stanislaw Lipinski and Damian Krychowski — Institute of Molecular Physics, Polish Academy of Sciences, Poznan, Poland

The out of equilibrium transport properties of carbon nanotube quantum dot coupled to ferromagnetic electrodes are studied by means of the non-equilibrium Green functions using equation of motion method. Polarization of electrodes introduces the spin dependence of tunneling rates and exchange splitting of the dot level. We point out on the possibility of achieving giant values of tunnel magnetoresistance in the Kondo range and discuss a prospect of gate control of this quantity. Change of the gate enables a control of the value and sign of polarization of conductance. For parallel orientation of polarizations of electrodes a significant decrease of the Fano factor is observed for gate potentials corresponding to vanishing exchange splitting. The exchange induced Kondo satellites reflect in the bias or gate dependences of spin resolved Fano factors.