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With a simply modified circuit design connecting a Pt/NiO/Pt capacitor to a serial load resistor (RL), resistive switching (RS) characteristics are significantly improved. Distributions of current at low-resistance state and switching voltages during reset and set processes are much reduced, and RS endurance is much enhanced. Using percolation theory, we find that a multiply connected conducting filament (CF) is preferentially formed in a Pt/NiO/Pt capacitor serially connected to an RLof 1 kΩ. The multiply connected CF may provide uniform heat distribution to a Pt/NiO/Pt capacitor, resulting in reduced randomness during heat-assisted reset process and improved RS characteristics.
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Hwang et al. (2012) studied this question.
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