Core Viewpoint - The research from the Institute of Physics, Chinese Academy of Sciences, reveals a significant breakthrough in ferroelectric materials, specifically in the atomic-level "one-dimensional charged domain walls" within zirconia, laying a new physical foundation for next-generation artificial intelligence devices [1][4]. Group 1: Breakthrough in Ferroelectric Materials - The research team confirmed that the width and thickness of these domain walls are only the size of a single crystal cell, confined within a two-dimensional polar layer, achieving the physical limit of size [3][10]. - This discovery unveils the charge screening mechanism of oxygen ions' "self-balancing," breaking through the traditional storage density bottleneck of two-dimensional domain walls [3][22]. - The unique "polarization-ion" coupling transport characteristics of this one-dimensional structure open new physical pathways for constructing high-energy-efficient brain-like computing chips and AI devices [4][24]. Group 2: Characteristics of Ferroelectric Materials - Ferroelectric materials are defined as a class of crystalline materials with spontaneous polarization, where the polarization direction can be reversed by an external electric field [6]. - These materials can be visualized as filled with tiny "electrical compasses" that indicate the direction of charge separation rather than geographical north and south [6][7]. - The concept of ferroelectric domains is introduced, where these "compasses" align in groups to minimize energy, forming domain walls that separate different polarization regions [8][9]. Group 3: Unique Structure of Domain Walls - The research team discovered that in zirconia, the originally broad two-dimensional "walls" are compressed into atomic-scale one-dimensional "lines" due to the material's unique sub-cell layered structure [11][12]. - These one-dimensional structures are not ordinary "walls" but special charged domain walls, categorized as "head-to-head" and "tail-to-tail" [12][13]. - The stability of these high-energy structures, which are typically unstable, is maintained through the introduction of high concentrations of point defects acting as "charge glue" [29][30]. Group 4: Implications for Data Storage and Ion Transport - The theoretical data storage density using these atomic-level one-dimensional domain walls can reach 20TB per square centimeter, equivalent to storing 10,000 HD movies on a device the size of a postage stamp [24]. - The material exhibits superior ionic conductivity at room temperature, outperforming traditional solid electrolytes like yttria-stabilized zirconia (YSZ), transforming it into a "highway" for ion transport [22][23]. - The research highlights a precise "charge compensation mechanism" that allows the one-dimensional domain walls to exist stably while facilitating efficient ionic conduction [36].

中国团队发现铁电材料新结构 将助力极限密度人工智能器件开发 中新网北京1月23日电 (记者 孙自法)在当今物质科学和信息技术交叉融合前沿的铁电材料与畴壁研究领 域，中国科学家团队最新研究发现一维带电畴壁新结构，补全了铁电物理的一块拼图，这不仅颠覆了人 们对于畴壁结构的传统认知，也为开发具有极限密度的人工智能器件奠定重要科学基础。 这项物理学基础前沿的重要研究突破，由中国科学院物理研究所/北京凝聚态物理国家研究中心金奎娟 院士、葛琛研究员、张庆华副研究员联合团队共同完成，他们通过激光法成功创制自支撑萤石结构铁电 薄膜，并利用先进的电子显微镜技术对薄膜中的一维带电畴壁进行原子尺度的观测和调控。北京时间1 月23日凌晨，相关成果论文在国际学术期刊《科学》(Science)上线发表。 何为铁电材料 研究团队介绍说，在物质世界中存在一类特殊的晶体材料，其内部由许多微小的"电学指南针"组成，它 们不是指向南北，而是指示正负电荷中心分离的方向，即自发极化的方向。物理学家称这种即使没有外 部电场也自发地存在正负电荷分离且规则排列的材料为铁电材料。 研究团队指出，他们从2018年便开始萤石结构铁电材料的研究，进行材料制备上的创 ...

我国新成果有望让器件"存得更多 占得更少"。 1月2 3日，从中国科学院物理研究所获悉，该所研究团队通过激光法创制了自支撑萤石结构铁电薄膜，并利用先进的电子显微镜技术对 薄膜中的一维带电畴壁（晶体结构）进行了原子尺度的观测和调控。相关成果1月23日在国际学术期刊《科学》发表。 ▲ 萤石结构铁电材料ZrO2（二氧化锆）中的一维带电畴壁示意图 那么自然界是否有合适的材料去构建超小型铁电畴壁从而提升存储密度呢？萤石结构铁电材料的出现带来了新机遇，它的三维晶体结构 是由极性晶格层和非极性晶格层交替排列组成。铁电极化被限制在分离的极性晶格层中，而且各极性晶格层几乎是完全独立的，因此原 本的三维铁畴"魔方"变成了分离的二维铁畴"拼图"。据此，在这种材料中可能存在一维的带电畴壁结构。如果存在的话，是怎样的物理 机制充当"胶水"来稳定了这些带电畴壁呢？我们又能否人为操控这些畴壁的产生、运动和擦除呢？ 科研团队发现这些带电畴壁被约束在极性晶格层中，厚度和宽度均具有埃级尺寸（约为人类头发直径的数十万分之一），畴壁处过量的 氧离子或氧空位充当了黏结的"胶水"稳定了这些带电的畴壁。研究团队利用电子辐照产生的局部电场演示了对这些一维带 ...