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Giant Electroresistance in Ferroelectric Tunnel Junctions

M. Ye. Zhuravlev·R. F. Sabirianov·S. S. Jaswal·E. Y. Tsymbal
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Abstract

The interplay between the electron transport in metal/ferroelectric/metal junctions with ultrathin ferroelectric barriers and the polarization state of a barrier is investigated. Using a model which takes into account screening of polarization charges in metallic electrodes and direct quantum tunneling across a ferroelectric barrier we calculate the change in the tunneling conductance associated with the polarization switching. We find the conductance change of a few orders of magnitude for metallic electrodes with significantly different screening lengths. This giant electroresistance effect is the consequence of a different potential profile seen by transport electrons for the two opposite polarization orientations.

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M. Ye. Zhuravlev, R. F. Sabirianov, S. S. Jaswal, E. Y. Tsymbal. 2005-02-03. Giant Electroresistance in Ferroelectric Tunnel Junctions. https://doi.org/10.1103/physrevlett.94.246802

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