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Oxygen vacancy-induced topological nanodomains in ultrathin ferroelectric films
npj Quantum Materials ( IF 5.7 ) Pub Date : 2021-05-13 , DOI: 10.1038/s41535-021-00349-y
Wei Peng , Junsik Mun , Qidong Xie , Jingsheng Chen , Lingfei Wang , Miyoung Kim , Tae Won Noh

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 BaTiO3 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.



中文翻译:

超薄铁电薄膜中氧空位诱导的拓扑纳米域

氧化物铁电体中的氧空位可以通过局部应变和电场与极性有序耦合,从而保持产生和​​稳定奇异极化图形的能力。然而,尽管进行了深入的理论研究,但是在实验中仍然没有清晰的显微图像将极化模式与氧空位的分布相关联。在这里,我们表明,在高质量的单轴铁电体系中,即压缩应变的BaTiO 3通过在保持结构完整性(即没有扩展的晶格缺陷)的同时有意地在膜中引入氧空位,可以创建超薄膜(低于10 nm)的纳米级极化结构。使用扫描透射电子显微镜,我们揭示了纳米域是由簇状氧空位附近的涡旋电偶极子组成的。这一发现为建立和理解长期寻求的拓扑极地物体(例如涡旋和天体)开辟了一条新的道路。

更新日期:2021-05-13
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