Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Spindependent Transportphenomena I
MA 5.9: Vortrag
Montag, 25. Februar 2008, 12:15–12:30, H 0112
Correlation effects in the magnetoresistance of Fe/FeO/MgO/Fe tunnel junctions — •Hossein Mirhosseini1, Kamal Krishna Saha2, Arthur Ernst1, Jürgen Henk1, and Patrick Bruno1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Oak Ridge National Laboratory, Oak Ridge, U. S. A.
Localized electrons are rather badly described within the local spin density approximation (LSDA) to density functional theory because the LSDA electron interacts with itself. The local self-interaction correction (LSIC) improves the description of these electrons significantly, as was shown especially for transition metal oxides [1]. Since an FeO layer is formed in Fe/MgO/Fe tunnel junctions [2], a considerable effect on the theoretical magnetoresistances is expected if the LSIC is applied to that layer.
We report on first-principles electronic-structure and transport calculations of Fe/FeO/MgO/Fe tunnel junctions with an application of the LSIC in the FeO layers. The transmittances for the LSDA and the LSDA+LSIC cases are compared, thus highlighting a proper description of oxide layers.
[1] M. Lüders et al., Phys. Rev. B 71 (2005) 205109.
[2] H. L. Meyerheim et al., Phys. Rev. Lett. 78 (2001) 076102.