Enhanced linear and symmetric synaptic weight update characteristics in a Pt/p-LiCoO<sub><i>x</i></sub>/p-NiO/Pt memristor through interface energy barrier modulation by Li ion redistribution

Jeong, Boyoung; Chung, Peter Hayoung; Han, Jimin; Noh, Taeyun; Yoon, Tae-Sik

doi:10.1039/d3nr06091h

Nanoscale

2024

DOI: 10.1039/d3nr06091h

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Enhanced linear and symmetric synaptic weight update characteristics in a Pt/p-LiCoO_x/p-NiO/Pt memristor through interface energy barrier modulation by Li ion redistribution

Boyoung Jeong,

Peter Hayoung Chung,

Jimin Han

et al.

Abstract: A memristor with a Pt/p-LiCoOx/p-NiO/Pt structure exhibited enhanced linear and symmetric conductance changes for synaptic weight update, which was driven by interface energy barrier modulation as a result of Li ion redistribution.

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Memristive Artificial Synapses Based on Brownmillerite for Endurable Weight Modulation

Lee,

Choi,

Baek

et al. 2024

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Exploring a computing paradigm that blends memory and computation functions is essential for artificial synapses. While memristors for artificial synapses are widely studied due to their energy‐efficient structures, random filament conduction in general memristors makes them less preferred for endurability in long‐term synaptic modulation. Herein, the topotactic phase transition (TPT) in brownmillerite‐phased (110)‐SrCoO2.5 (SCO2.5) is harnessed to enhance the reversibility of oxygen ion migration through 1‐D oxygen vacancy channels. By employing a heteroepitaxial structured 2‐terminal configuration of Au/SCO2.5/SrRuO3/SrTiO3, the brownmillerite SCO2.5‐based synapse artificial synapses are exploited. Demonstration of the TPT behavior is corroborated by comparing oxygen migration energy by density‐functional theory calculations and experimental results, and by monitoring the voltage pulse‐induced peak shift in the Raman spectra of SCO2.5. With the voltage pulse‐driven TPT behaviors, it is reliably characterized by linear, symmetric, and endurable long‐term potentiation and depression performances. Notably, the durability of the TPT‐based weight control mechanism is demonstrated by achieving consistent and noise‐free weight updates over 32 000 iterations across 640 cycles. Furthermore, learning performances based on deep neural networks and convolutional neural networks on various image datasets yielded very high recognition accuracy. The work offers valuable insights into designing memristive synapses that enable reliable weight updates in neural networks.

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Memristive Artificial Synapses Based on Brownmillerite for Endurable Weight Modulation

Lee,

Choi,

Baek

et al. 2024

Small

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Volatile tin oxide memristor for neuromorphic computing

Ju,

Kim

2024

iScience

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Achieving Entire Seven Fundamental Boolean Logic Operations in a Two-Terminal Li-Based Memristor

Feng,

Hu,

Yin

et al. 2024

ACS Appl. Electron. Mater.

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Conventional logic operations transmitting data between processing and the memory unit inevitably result in a "memory wall" and energy consumption dilemmas. The memristor provides an alternative solution at the device level by integrating logic operations and memory functions, however, a combination of multistage operations in memristors is required to achieve fundamental Boolean logic calculations, especially for XOR/XNOR. In this work, we implement the XOR/XNOR through leveraging bifunctional oxygen-containing Ti thin films as both current collectors and Li-reservoirs in a two-terminal Li-based memristor, i.e., ITO/Nb 2 O 5 /LiCoO 2 /Ti. When Li-ions are inserted into oxygen-containing Ti under reversed voltage and partially reduce the high-valence Ti, the subsequent postsynaptic current exceeds the threshold, thereby realizing the XOR/XNOR logic operations. Therefore, the entire seven fundamental Boolean logic operations can be achieved in an individual device, featuring biological-like synaptic plasticity without redundant circuit design. Through electrochemical modulation of pulse parameters, the artificial synapse demonstrates versatile types of short-term potentiation, encompassing pair-pulse facilitation, spike-voltagedependent plasticity, and spike-rate-dependent-plasticity (SRDP). The SRDP displays properties analogous to a high-pass filter as discernible distinction of current response within and beyond the frequency of 1 Hz. Furthermore, the Physiological functions of Ebbinghaus' memory curves and Pavlov's classical conditioning experiment are emulated on this single memristor based on the principles of long-term potentiation.

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Enhanced linear and symmetric synaptic weight update characteristics in a Pt/p-LiCoO_x/p-NiO/Pt memristor through interface energy barrier modulation by Li ion redistribution

Abstract: A memristor with a Pt/p-LiCoOx/p-NiO/Pt structure exhibited enhanced linear and symmetric conductance changes for synaptic weight update, which was driven by interface energy barrier modulation as a result of Li ion redistribution.

Cited by 3 publications

References 60 publications

Memristive Artificial Synapses Based on Brownmillerite for Endurable Weight Modulation

Memristive Artificial Synapses Based on Brownmillerite for Endurable Weight Modulation

Volatile tin oxide memristor for neuromorphic computing

Achieving Entire Seven Fundamental Boolean Logic Operations in a Two-Terminal Li-Based Memristor

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Enhanced linear and symmetric synaptic weight update characteristics in a Pt/p-LiCoOx/p-NiO/Pt memristor through interface energy barrier modulation by Li ion redistribution

Abstract: A memristor with a Pt/p-LiCoOx/p-NiO/Pt structure exhibited enhanced linear and symmetric conductance changes for synaptic weight update, which was driven by interface energy barrier modulation as a result of Li ion redistribution.

Cited by 3 publications

References 60 publications

Memristive Artificial Synapses Based on Brownmillerite for Endurable Weight Modulation

Memristive Artificial Synapses Based on Brownmillerite for Endurable Weight Modulation

Volatile tin oxide memristor for neuromorphic computing

Achieving Entire Seven Fundamental Boolean Logic Operations in a Two-Terminal Li-Based Memristor

Contact Info

Product

Resources

About

Enhanced linear and symmetric synaptic weight update characteristics in a Pt/p-LiCoO_x/p-NiO/Pt memristor through interface energy barrier modulation by Li ion redistribution