Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Joint Session "Spincaloric Transport" (jointly with TT)
MA 50.5: Vortrag
Freitag, 30. März 2012, 10:30–10:45, EB 301
Spin dependent electronic-transport calculations of Co2FeAl and Co2FeSi — •Denis Comtesse1, László Szunyogh2, Heike C. Herper1, and Peter Entel1 — 1Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — 2Institute of Physics, Budapest University of Technology and Economics, Budafoki út 8, H1111 Budapest
We present ab initio calculations of the electronic-transport properties perpendicular to the planes of Co2FeAl and Co2FeSi with Pt contacts. We use a fully relativistic description of the electronic structure within the screened Korringa-Kohn-Rostoker (SKKR) [1] formalism. The Kubo-Greenwood formalism is employed to calculate the electronic-transport and the spin projection operator introduced by Lowitzer et al. [2] is used to evaluate the spin dependent contributions to the total current. In addition we investigate which regions of the two dimensional Brillouin zone give the main contributions to the transport of the two spin channels. It is found that only small characteristically distributed regions of the Brillouin zone contribute significantly to the current in Co2FeAl and Co2FeSi. Furthermore, we investigate how the transport properties change with increasing system size. Therefore, systems with different numbers of layers between the leads have been taken into account. Financial support by Deutsche Forschungsgemeinschaft within the priority program SPP 1538 is greatfully acknowleged.