Vortex Topology Facilitates Biomimetic Synaptic Plasticity in Potassium Sodium Niobate Lead-Free Ferroelectric Thin Films

IF 13 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2025-06-03 DOI:10.1002/smll.202502912
Zhonglei Liu, Jinming Cao, Qiaoling Wang, Hua Hou, Yuhong Zhao
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引用次数: 0

Abstract

Multilevel memristors based on perovskite are promising candidates for high-density storage, and controllable vortex topologies have significant application potential in biomimetic synapses. However, realizing complete and efficient biological synaptic functions that combine memory and computation remains a long-standing challenge. In this paper, by matching synaptic plasticity electric field design, seven types of biological synaptic neuron functions are fully realized for the first time through vortex structures in the potassium sodium niobate thin films. Through the analysis of the phase-field method, it is demonstrated that the domain pattern transformation realized by different functions mainly comes from the energy competition between ferroelastic twin domain walls and different electric field pulses. By analyzing the enhanced signal positions from two opposite sources, it is found for the first time that the ferroelastic twin domain structure simultaneously causes two polarization variants in opposite out-of-plane directions. Based on more than 100 functional regions, under the applied electric field of 0.01 V nm−1, the realized paired pulse facilitation function has a signal enhancement up to 16 times relative to traditional transistors. Both spiking-timing-dependent plasticity and spiking-rate-dependent plasticity achieve exceeding 80% pulse signal recognition performance. This will promote the realization of easily integrated independent biological synaptic neurons in bionics.

Abstract Image

漩涡拓扑结构促进铌酸钾钠无铅铁电薄膜的仿生突触可塑性
基于钙钛矿的多电平记忆电阻器是高密度存储的理想选择,可控涡旋拓扑结构在仿生突触中具有重要的应用潜力。然而,实现完整和有效的结合记忆和计算的生物突触功能仍然是一个长期的挑战。本文通过匹配突触可塑性电场设计,首次在铌酸钾钠薄膜中通过涡旋结构完全实现了7种生物突触神经元功能。通过对相场法的分析,证明了不同函数实现的畴图变换主要来自于铁弹性双畴壁和不同电场脉冲之间的能量竞争。通过分析两个相对源的增强信号位置,首次发现铁弹性双畴结构同时引起两个相反的面外方向极化变化。在超过100个功能区的基础上,在0.01 V nm−1的外加电场下,实现的配对脉冲促进功能与传统晶体管相比,信号增强达16倍。与脉冲时间相关的可塑性和与脉冲速率相关的可塑性均实现了超过80%的脉冲信号识别性能。这将促进仿生学中易于集成的独立生物突触神经元的实现。
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来源期刊
Small
Small 工程技术-材料科学:综合
CiteScore
17.70
自引率
3.80%
发文量
1830
审稿时长
2.1 months
期刊介绍: Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.
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