Figure 2.

Transport characteristics in the first and second sweep cycles. (a) During the first sweep cycle, the voltage is swept in the forward direction until the device switches to high-resistance state. During the reverse sweep, the device remains in the high-resistance and shows hysteresis. (b) The device remains in the high-resistance state during the second sweep cycle and no hysteresis or switching is observed.

Umair et al. Nanoscale Research Letters 2013 8:476   doi:10.1186/1556-276X-8-476
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