Room temperature memristive switching in nano-patterned LaAlO₃/SrTiO₃ wires with laterally defined gates

We present room temperature memristive switching in a nano-patterned LaAlO₃/SrTiO₃ wire with laterally defined gates in proximity to the wire. Closed bias voltage sweeps show pinched hysteresis loops with zero bias resistance values of up to R_on = 8 MΩ and R_off = 1.2 GΩ for the on and off state, respectively. The maximum R_off/R_on ratio is 150. Frequency dependent measurements show a cutoff frequency of around 10 Hz, and the alteration of set point voltages enables us to precisely set and control the resistance off-on ratio. We explain the memristive switching by charge localization on the laterally defined gates, which couple capacitively to the wire and enhance or decrease the resistance dependent on the amount of transferred charges. Our finding enables the realization of geometry-based memristive switching devices, which make use of the form-dependent wire-gate capacitance.