Dresden 2003 – wissenschaftliches Programm

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SYCN: Computational nanoscience - from materials to biology

SYCN 101: Computational Nanoscience: From Materials to Biology (Hauptvortr
äge)

SYCN 101.2: Hauptvortrag

Dienstag, 25. März 2003, 15:00–15:30, ZEU/160

Spin transport from first principles — •Paul Kelly — University of Twente, The Netherlands

Interfaces play a crucial role in nanoscale electronic devices. The spin-dependence of electronic transport across an interface is an essential element in understanding giant magnetoresistance in layered metallic structures and related effects such as point contact Andreev reflection at Ferromagnet/Superconductor contacts. We have developed a method based on first-principles density functional theory and the tight-binding linear-muffin-tin orbital surface Green’s function method to calculate the spin-dependent interface resistances for interfaces such as Co/Cu, Fe/Cr, Cu/Ag and Cu/Nb. Disorder is treated by means of large lateral supercells. Without introducing any free parameters, quantitative agreement with experiment is obtained. Even ideal interfaces can have very low transmission which may be increased by disorder.

* Work carried out in collaboration with G.E.W. Bauer, S. Gerritsen, M. Talanana, I. Turek, K. Xia, and M. Zwierzycki