铁电性
材料科学
拓扑缺陷
极化(电化学)
凝聚态物理
偶极子
扫描透射电子显微镜
纳米尺度
氧气
化学物理
透射电子显微镜
拓扑(电路)
极地的
纳米技术
光电子学
电介质
化学
物理
电气工程
工程类
物理化学
有机化学
天文
作者
Wei Peng,Je‐Ho Mun,Qidong Xie,Jingsheng Chen,Lingfei Wang,Miyoung Kim,Tae Won Noh
标识
DOI:10.1038/s41535-021-00349-y
摘要
Abstract Oxygen vacancy in oxide ferroelectrics can be strongly coupled to the polar order via local strain and electric fields, thus holding the capability of producing and stabilizing exotic polarization patterns. However, despite intense theoretical studies, an explicit microscopic picture to correlate the polarization pattern and the distribution of oxygen vacancies remains absent in experiments. Here we show that in a high-quality, uniaxial ferroelectric system, i.e., compressively strained BaTiO 3 ultrathin films (below 10 nm), nanoscale polarization structures can be created by intentionally introducing oxygen vacancies in the film while maintaining structure integrity (namely no extended lattice defects). Using scanning transmission electron microscopy, we reveal that the nanodomain is composed of swirling electric dipoles in the vicinity of clustered oxygen vacancies. This finding opens a new path toward the creation and understanding of the long-sought topological polar objects such as vortices and skyrmions.
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