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Abstract
We report on a novel non-volatile memory concept for resistive information storage. The particular device structure consists of a conductive ferroelectric/non-ferroelectric 2-layer sequence. Resistive switching is observed, by applying a voltage pulses. Our model predicts that the switching correlates with a change of the potential barrier height inside the structure. It may also explain resistive switching in systems consisting only of one ferroelectric layer and by assuming the presence of non-ferroelectric interface layers.
The operation of the device is demonstrated for the PZT (48/52) system with a SrRuO3 bottom electrode and a Pt top electrode. The simulated and measured I-V curves are in good agreement.
ACKNOWLEDGEMENT
The research described in this paper was supported in part by the HGF-Strategiefonds “Piccolo” and the Volkswagen-Stiftung Project “Nano-sized ferroelectric hybrids” under Contract No. I/77737. We acknowledge the financial support by the DFG. We also acknowledge R. Waser, Jürgen Schubert, Christoph Buchal, Andreas Gerber, Marin Alexe, Steven Ducharme, Ravi Droopad, R. Ramesh, V. Nagarajan, and Kristoff Szot for helpful and interesting discussions.
