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• W4307112712 endingPage "155411" @default.
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• W4307112712 abstract "• Emulation of bio-synaptic characteristics in electronic synapses based on forming-free Au-ion implanted HfOx memristors are demonstrated using conductive atomic force microscopy (cAFM). • The devices exhibit essential synaptic functions such as long-term potentiation/depression, spike rate dependent plasticity, and paired pulse facilitation. • Linear synaptic potentiation has been achieved in artificial HfOx synapses under identical voltage pulses for the first time at nanoscale, which is necessary to obtain high learning efficiency. • The linearity in synaptic potentiation has been demonstrated irrespective of the amplitude, width, and interval of the applied pulses. • Defect modulation within the HfOx film due to ion-implantation can be correlated well with Kelvin probe force microscopy (KPFM) and dynamic TRIDYN simulation studies. • Fabrication of oxide-based highly stable memristors and to have a gradient in oxygen vacancy concentrations due to metal ion-implantation is found to be an efficient tool to build artificial synapses for neuromorphic computing applications. The fabrication of nanoscale electronic synapses is an essential step towards the development of neuromorphic devices having a high integration density. Excellent learning abilities of such electronic synapses are crucial for the emulation of human brain potentialities. In order to achieve the same, linearly potentiated synaptic weight modulation (having negligible variability at nanoscale) is a primary and essential requirement. Here, we investigate solid-state memristor-based nanoscale synaptic emulators that exhibit linearly potentiated synaptic weight entries irrespective of amplitude, width, and frequency of the input voltage pulses. The memristive synapses under consideration replicate all the essential synaptic functions including potentiation and depression, spike-rate dependent plasticity, paired-pulse facilitation, and both excitatory-inhibitory responses and therefore, fulfil the requirements to build neuromorphic devices which can emulate brain-like functionalities. The incorporation of metallic ions in an amorphous oxide thin film leads to both distinctly linear weight adjustability and highly stable resistive switching operation which depend on the amplitude of the driving bias voltage. This study will help to understand and optimize the linearity in performances of oxide memristor-based synapses for neuromorphic applications." @default.
• W4307112712 created "2022-10-27" @default.
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• W4307112712 date "2023-02-01" @default.
• W4307112712 modified "2023-10-18" @default.
• W4307112712 title "Linearly potentiated synaptic weight modulation at nanoscale in a highly stable two-terminal memristor" @default.
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• W4307112712 doi "https://doi.org/10.1016/j.apsusc.2022.155411" @default.
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