Large Room-Temperature Electroresistance in Dual-Modulated Ferroelectric Tunnel Barriers
Greta Radaelli, Diego Gutiérrez, Florencio Sánchez, Riccardo Bertacco, Massimiliano Stengel and Josep Fontcuberta*
Pt/BaTiO3/La0.7Sr0.3MnO3 tunnel junctions, at negative voltage bias, for two polarization directions are represented. It is demonstrated that reversing the polarization direction of a ferroelectric barrier in a tunnel junction leads to a change of junction conductance and capacitance, with concomitant variations on the barrier height and effective thickness, both contributing to produce larger electroresistance.
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