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(a) Schematic illustration of the PPF behavior of a biological synapse between a pre-synaptic neuron and a post-synaptic neuron. 2 The synaptic strength is modified by the concentrations of the ionic species (e.g., Na+, Ca2+, Mg2+). With a pair of stimuli, the post-synaptic current (or post-synaptic potential) induced by the second pulse is larger than that by the first pulse. (b) The PPF phenomenon of a NiOx-based memristor observed in the present study. A pair of voltage pulses were applied to the memristor (the left panel), and the corresponding current of the memristor was measured (the right panel).
PPF of the memristor as a function of the pulse interval with the pulse magnitude and width fixed at 1.8 V and 5 ms, respectively. The PPF measurement was conducted on 10 virgin devices for each pulse interval. The inset illustrates the pattern of a pair of voltage pulses with a pulse interval between the two pulses applied to the memristor. The fitting with Eq. (2) to the measured PPF values yields c 1 = 30%, c 2 = 72%, τ 1 = 53 ms, and τ 2 = 1111 ms.
PPF as a function of the pulse magnitude (a) and pulse width (b). A PPF measurement was conducted on 10 virgin devices, and the statistical distribution of the PPF value is shown in the figure. In (a), the pulse width and pulse interval were 5 ms and 100 ms, respectively; and in (b),the pulse magnitude and pulse interval were 2 V and 100 ms, respectively.
Influence of the pulse magnitude and pulse width on the parameters c 1, c 2, τ 1, and τ 2. The values of the parameters were obtained from the fitting with Eq. (2) to the measured PPF values. A PPF measurement was conducted on 10 virgin devices.
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