Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: TR: Nanoelectronics II: Spintronics and Magnetotransport

TT 6.14: Vortrag

Montag, 22. März 2010, 17:30–17:45, H19

Ballistic transport in 1D magnetic systems based on the FLAPW Method and Wannier functions — •Björn Hardrat¹, Neng-Ping Wang², Yuriy Mokrousov³, Frank Freimuth³, and Stefan Heinze¹ — ¹Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, D-24098 Kiel, Germany — ²Physics Departement, Ningbo Univeristy, Fenghua Road 818, 315211 Ningbo, P.R. China — ³Institut für Festkörperforschung, Forschungszentrum Jülich, D-52435 Jülich, Germany

We report the development of a ballistic transport code for one-dimensional magnetic systems based on Wannier functions (WF) constructed within the full-potential linearized augmented plane-wave (FLAPW) method. We describe the details of the construction of first-shot (fsWF) or maximally localized (MLWF) WFs from the FLAPW wavefunctions choosing a monoatomic Pt chain as a model system. For the calculation of ballistic transport, we apply the Landauer formalism using Green's functions, which allows us to obtain the conductance of the system. As first applications of the approach, we study the transition from the contact to the tunneling regime in monoatomic Pt wires, with and without spin-orbit coupling (SOC), as well as in ferromagnetic Co wires, for which we calculated the tunneling magneto resistance (TMR). Furthermore we investigate the effect of single defect Pt and Co scatterers on the transmission through such monowires.