Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 25: Spinabh
ängige Transportph
änomene I

MA 25.7: Vortrag

Donnerstag, 27. März 2003, 16:45–17:00, HSZ/04

Spin-dependent ballistic electron transport through Fe/MgO/Fe from ab-initio Green function embedding — •Stefan Blügel1,2, Daniel Wortmann1, and Hiroshi Ishida31Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich — 2Fachbereich Physik, Universität Osnabrück, 49069 Osnabrück — 3Nihon-University, Tokyo, Japan

An investigation of the Fe/MgO/Fe junction as a model system for tunnel-magneto-resistance (TMR) devices will be presented. We focus on the role of the electronic and geometric interface structure on the spin-dependent conductance by taking the interlayer relaxation at the Fe/MgO interface and the effect of a formation of interface FeO into account. We apply a recently developed efficient method for calculating the conductance of ballistic electrons through an interface from first-principles using the embedding approach of Inglesfield. In our method the Landauer-Büttiker formula for ballistic transport is expressed in terms of quantities that are available in the embedded Green-function calculations. The embedding approach is implemented within the full-potential linearized augmented plane method as realized in the FLEUR code.

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