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Title:Resonant electronic states and I-V curves of Fe/MgO/Fe(100) tunnel junctions
Authors:I. Rungger, O. Mryasov, and S. Sanvito, 2009
Abstract: The bias dependence of the tunnel magnetoresistance (TMR) of Fe/MgO/Fe tunnel junctions is investigated theoretically with a fully self-consistent scheme that combines the nonequilibrium Green's-function method with density-functional theory. At voltages smaller than 20 mV the I-V characteristics and the TMR are dominated by resonant transport through narrow interface states in the minority-spin band. In the parallel configuration this contribution is quenched by a voltage comparable to the energy width of the interface state, whereas it persists at all voltages in the antiparallel configuration. At higher bias the transport is mainly determined by the relative positions of the Δ1 band edges in the two Fe electrodes, which causes a decrease in the TMR.
ICHEC Project:Transport properties of organic macromolecules: modeling at the boundaries between biology and nano-electronics
Publication:Phys. Rev. B, 79, 094414, (2009)
URL: http://link.aps.org/doi/10.1103/PhysRevB.79.094414
Keywords: density functional theory, Green's function methods, iron, magnesium compounds, magnetic multilayers, resonant tunnelling, tunnelling magnetoresistance
Status: Published

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