Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 16: Spinelektronik

MA 16.4: Vortrag

Donnerstag, 14. März 2002, 18:15–18:30, H10

The role of interfaces in the magnetoresistance of Au/Fe/Au/Fe multilayers — •László Szunyogh1,2, Peter Weinberger1, Theodor L. Mochesky3, and Bretislav Heinrich31Center for Computational Materials Science, Technical University of Vienna, Getreidemarkt 9/158, A-1060 Vienna, Austria — 2Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1521, Budapest, Hungary — 3Physics Department, Simon-Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada

By using the fully relativistic spin-polarized screened Korringa-Kohn-Rostoker method and the Kubo-Greenwood equation, the current-in-plane (CIP) resistivity and Giant Magnetoresistance are evaluated for Fe/Au/Fe/Au spin-valves assuming both bcc-like Fe and fcc-Au leads. The theoretically obtained values for a spacer thickness of 7 ML of Au are in fairly good agreement with the corresponding experimental data. These data, in particular, the temperature dependence of the resistivity reported in here, are carefully analyzed with respect to the experimental set-up and related to the theoretical model assumed. Since in the theoretical calculations interdiffused interfaces can be taken into account by means of the inhomogeneous coherent potential approximation, the role of the interfaces in the magnetoresistance of this system is discussed in-depth.

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