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MA: Magnetismus

MA 6: Spinabhängige Transportphänomene I

MA 6.4: Vortrag

Montag, 11. März 2002, 16:00–16:15, H22

A Transfer Matrix Method for Ballistic Transport — •Stefan Blügel³, Daniel Wortmann¹, Hiroshi Ishida², and Gustav Bihlmayer¹ — ¹Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich — ²Nihon University, Sakura-josui, Tokyo 156, Japan — ³Fachbereich Physik, Universität Osnabrück, 49069 Osnabrück

After the discovery of the giant magneto resistance (GMR) effect magnetotransport has been extensively studied in the last couple of years. However, the complicated interplay between electronic and atomic structure makes a theoretical description beyond idealized models very challenging. So far only few ab-initio calculations of electronic transport have been reported. The FLAPW-method is an excellent tool to determine the relaxation and the electronic structure of oxides and semiconductors in contact with magnetic materials. However, the description of transport properties seems less natural within the FLAPW method as in the KKR method for example, which is based on a scattering formalism. We present a new transfer matrix method which overcomes this limitation. From the transfer matrix, both the complex band structure and the transmission coefficients, needed in the Landauer-Büttiker formulation of ballistic transport, are easily obtained. The method is based on a Green’s function formalism within the FLAPW basis set. Both the theory and a first application will be discussed.