Giant Electroresistance in Ferroelectric Tunnel Junctions

Details Giant Electroresistance in Ferroelectric Tunnel Junctions Giant Electroresistance in Ferroelectric Tunnel Junctions

2005-02-03

arxiv.org/abs/cond-mat/0502109v1

Physics

Condensed Matter

Other Condensed Matter

4 pages

Scientific paper

10.1103/PhysRevLett.94.246802

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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