A study of the symmetry properties and multi-state nature of perovskite oxide-based electrical pulse induced resistance-change devices

Abstract

A new symmetric two-terminal non-volatile electrical pulse induced resistance-change (EPIR) device is fabricated in the Pr0.7Ca 0.3MnO3 (PCMO) materials system and analysed. Two actual devices of somewhat different construction are tested. Both consist of two similar half-parts, characterized by similar resistance versus pulse voltage hysteresis loops, which are reversely connected together in series forming a reflection symmetric device. Even though the devices are as physically symmetric as possible, they are found to exhibit resistance-switching under the application of voltage pulses of different amplitude and of different polarities. A symmetric model of the above device is proposed, and its analysis confirms the features noted above. The switching is history dependent and shows multi-intrinsic state resistance switching, which is very useful for developing future multi-bit EPIR devices. © IOP Publishing Ltd. and Deutsche Physikalische Gesellschaft.