Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.78: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Spin-polarized current through organic molecules — •Daungruthai Jarukanont, Samuel Baltazar Rojas, Alan Kalitsov, and Martin E. Garcia — Institut für Physik Universität Kassel

The study of molecular electronics has attracted a lot of interest in recent years. In this field, one attempts to make electronic devices using organic molecules. In order to manipulate such devices, it's very important to have a good understanding of the molecular transport properties. We study the tunneling of spin-polarized electrons through molecules that are weakly coupled to ferromagnetic electrodes.

We model our system by sandwiching molecules in between two magnetic electrodes, where a small bias is applied to see the I-V characteristics. The calculations are based on the non-equilibrium Green's function and the Keldysh formalism. The electronic states are described by the tight-binding model. We have studied a dependence of the tunneling current on the relative orientation of the magnetizations of the electrodes. We hope that these studies will allow us to suggest an appropriate choice for molecules for molecular electronics devices.