A Study of Apparent Symmetry Breakdown in Perovskite Oxide-based Symmetric RRAM Devices

Details A Study of Apparent Symmetry Breakdown in Perovskite Oxide-based Symmetric RRAM Devices A Study of Apparent Symmetry Breakdown in Perovskite Oxide-based Symmetric RRAM Devices

2005-10-03

arxiv.org/abs/cond-mat/0510059v1

refer to New Journal of Physics, 8 (2006) 229.

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 4 figures

Scientific paper

A new model of a symmetric two-terminal non-volatile RRAM device based on Perovskite oxide thin film materials, specifically Pr1-xCaxMnO3 (PCMO), is proposed and analyzed. The model consists of two identical half-parts, which are completely characterized by the same resistance verses pulse voltage hysteresis loop, connected together in series. Even though the modeled device is physically symmetric with respect to the direction of current, it is found to exhibit switching of the resistance with the application of voltage pulses of sufficient amplitude and of different polarities. The apparent breakdown of parity conservation of the device is attributed to changes in resistance of the active material layer near the electrodes during switching. Thus the switching is history dependent, a feature that can be very useful for the construction of real non-volatile memory devices. An actual symmetric device, not previously reported in the literature and based on the proposed model, is fabricated in the PCMO material system. Measurements of the resistance of this new device generated an experimental hysteresis curve that matches well the calculated hysteresis curve of the model, thus confirming the features predicated by the new symmetric model.

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