Adaptive Crystallite Kinetics in Homogenous Bilayer Oxide Memristor for Emulating Diverse Synaptic Plasticity. (25th March 2018)

• Record Type: Journal Article
• Authors: Yin, Jun; Zeng, Fei; Wan, Qin; Li, Fan; Sun, Yiming; Hu, Yuandong; Liu, Jialu; Li, Guoqi; Pan, Feng
• Is Part Of: Advanced functional materials. Volume 28:Number 19(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-03-25
• Subjects: crystallite coalescence -- oxide memristors -- oxygen vacancy -- phase transformation -- synaptic dynamics; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201706927
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: A critical routine for memristors applied to neuromorphic computing is to approximate synaptic dynamic behaviors as closely as possible. A type of homogenous bilayer memristor with a structure of W/HfO y /HfO x /Pt is designed and constructed in this paper. The memristor replicates the structure and oxygen vacancy ( V O ) distribution of a complete synapse and its Ca 2+ distribution, respectively, after the forming process. The detailed characterizations of its atomic structure and phase transformation in and near the conductive channel demonstrate that the crystallite kinetics are adaptively coupled with the V O migration prompted by directional external bias. The extrusion (injection) of the V O s and the subsequent crystallite coalescence (separation), phase transformation, and alignment (misalignment) resemble closely the Ca 2+ flux and neurotransmitter dynamics in chemical synapses. Such adaptation and similarity allow the memristor to emulate diverse synaptic plasticity. This study supplies a kinetic process of conductive channel theory for bilayer memristors. In addition, our memristor has very low energy consumption (5–7.5 fJ per switching for a 0.5 µm diameter device, compatible with a synaptic event) and is therefore suitable for large‐scale integration used in neuromorphic networks. Abstract : A homogenous bilayer memristor replicates structure and oxygen vacancy ( V O ) distribution of a complete synapse and Ca 2+ distribution, respectively. Crystallite kinetics are adaptively coupled with the V O migration, including crystallite coalescence, phase transformation, and alignment, which resemble closely the Ca 2+ flux and neurotransmitter dynamics in chemical synapses. Such adaptation and similarity permits emulating diverse synaptic plasticity.