Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 30: Spinabh
ängige Transportph
änomene II
MA 30.4: Vortrag
Freitag, 28. März 2003, 11:30–11:45, HSZ/401
Spin-filter effect in metallic nanowires — •P. Zahn1, N. Papanikolaou1,2, J. Opitz1,3, and I. Mertig1 — 1Fachbereich Physik, MLU Halle, D-06099 Halle, Germany — 2Institute of Material Science, NCSR ’Demokritos’, GR-15310 Aghia Paraskevi Attiki, Greece — 3Max-Bergmann-Zentrum für Biomaterialien, TU Dresden, D-01062 Dresden
We present ab initio calculations for metallic nanowires with a diameter of few atoms. The electronic structure is calculated using the screened Korringa-Kohn-Rostoker Green’s function method, while electronic transport properties are obtained using a Green’s function formulation of the Landauer formalism. We focus on the effect of scattering due to transition metal impurities on the conductance of a Cu wire. For a single defect, our results show a reduction of the transmission for energies at the impurity d state and due to the spin-polarization conductance is different for the two-spin directions causing a spin-filter effect. For a defect pair, quantum interference effects lead to a complicated energy dependence of the conductance.