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Ultrathin Non-Ising Charged Domain Walls Confined in BiFeO3 Nanocrystals
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-09-07 , DOI: 10.1002/adfm.202207730 Lisha Liu 1, 2 , Kun Xu 3, 4 , Qian Li 1 , Yu Huang 1 , Liang Shu 1 , Yue‐Yu‐Shan Cheng 1 , Suwei Zhang 1 , Jin Luo 1 , Jing Zhu 3, 4 , Jing‐Feng Li 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-09-07 , DOI: 10.1002/adfm.202207730 Lisha Liu 1, 2 , Kun Xu 3, 4 , Qian Li 1 , Yu Huang 1 , Liang Shu 1 , Yue‐Yu‐Shan Cheng 1 , Suwei Zhang 1 , Jin Luo 1 , Jing Zhu 3, 4 , Jing‐Feng Li 1
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Rich functionalities have been identified for domain walls (DWs, naturally occurring interfaces in ferroics), e.g., enhanced conductance and photovoltaic effect, which specify the interest in their internal structure. The dimension/width and type are of particular interest, which is the carrier of their functionality. Recent attention has been focused on head-to-head or tail-to-tail charged DWs with greatly enhanced conductivity compared to the inner domains, which are found to be an order of magnitude thicker (tens of unit cells) than normal neutral DWs. In this study, ultrathin non-Ising charged DWs are found, where polarization switched their direction within 2–3 unit cells in self-assembled BiFeO3 nanocrystals. An analytical model and finite element method simulation are used to interpret the origin of this phenomenon, i.e., electrostatic constraints linked to DW configurations in a ferroelectric. This study indicates that as an intrinsic property, the width of the ferroic DWs varies with different electrostatic constraints and must be taken into consideration during its applications.
中文翻译：
限制在 BiFeO3 纳米晶体中的超薄非 Ising 带电畴壁
畴壁（DW，铁质材料中天然存在的界面）已经确定了丰富的功能，例如，增强的电导和光伏效应，这说明了对其内部结构的兴趣。尺寸/宽度和类型特别令人感兴趣，这是它们功能的载体。最近的注意力集中在头对头或尾对尾带电的 DW 上，与内部域相比，其电导率大大提高，发现内部域比正常的中性 DW 厚一个数量级（数十个晶胞）。在这项研究中，发现了超薄的非 Ising 带电 DW，其中极化在自组装 BiFeO 3的 2-3 个晶胞内改变了方向纳米晶体。分析模型和有限元方法模拟用于解释这种现象的起源，即与铁电体中的 DW 配置相关的静电约束。该研究表明，作为一种内在特性，铁氧体 DW 的宽度随不同的静电约束而变化，在其应用过程中必须加以考虑。
更新日期：2022-09-07
中文翻译：
限制在 BiFeO3 纳米晶体中的超薄非 Ising 带电畴壁
畴壁（DW，铁质材料中天然存在的界面）已经确定了丰富的功能，例如，增强的电导和光伏效应，这说明了对其内部结构的兴趣。尺寸/宽度和类型特别令人感兴趣，这是它们功能的载体。最近的注意力集中在头对头或尾对尾带电的 DW 上，与内部域相比，其电导率大大提高，发现内部域比正常的中性 DW 厚一个数量级（数十个晶胞）。在这项研究中，发现了超薄的非 Ising 带电 DW，其中极化在自组装 BiFeO 3的 2-3 个晶胞内改变了方向纳米晶体。分析模型和有限元方法模拟用于解释这种现象的起源，即与铁电体中的 DW 配置相关的静电约束。该研究表明，作为一种内在特性，铁氧体 DW 的宽度随不同的静电约束而变化，在其应用过程中必须加以考虑。
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