Large Room-Temperature Electroresistance in Dual-Modulated Ferroelectric Tunnel Barriers

Greta Radaelli, Diego Gutiérrez, Florencio Sánchez, Riccardo Bertacco, Massimiliano Stengel and Josep Fontcuberta^*

Advanced Materials

DOI: 10.1002/adma.201405117

Pt/BaTiO₃/La_0.7Sr_0.3MnO₃ 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.