Resonant electronic states and I-V curves of Fe-MgO-Fe100 tunnel junctions - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




Resonant electronic states and I-V curves of Fe-MgO-Fe100 tunnel junctions - Condensed Matter > Mesoscale and Nanoscale Physics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The bias dependence of the tunnel magnetoresistance TMR of Fe-MgO-Fe tunneljunctions is investigated theoretically with a fully self-consistent schemethat combines the non-equilibrium Green-s functions method with densityfunctional theory. At voltages smaller than 20 mVolt the I-V characteristicsand the TMR are dominated by resonant transport through narrow interface statesin the minority spin-band. In the parallel configuration this contribution isquenched by a voltage comparable to the energy width of the interface state,whereas it persists at all voltages in the anti-parallel configuration. Athigher bias the transport is mainly determined by the relative positions of the$\Delta 1$ band-edges in the two Fe electrodes, which causes a decrease of theTMR.



Autor: Ivan Rungger, Oleg N. Mryasov, Stefano Sanvito

Fuente: https://arxiv.org/







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