| Title | Atomic-scale observations of electrical and mechanical manipulation of topological polar flux closure |
| Authors | Li, Xiaomei Tan, Congbing Liu, Chang Gao, Peng Sun, Yuanwei Chen, Pan Li, Mingqiang Liao, Lei Zhu, Ruixue Wang, Jinbin Zhao, Yanchong Wang, Lifen Xu, Zhi Liu, Kaihui Zhong, Xiangli Wang, Jie Bai, Xuedong |
| Affiliation | Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China Hunan Univ Sci & Technol, Dept Phys & Elect Sci, Xiangtan 411201, Peoples R China Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Peoples R China Zhejiang Univ, Dept Engn Mech, Hangzhou 310027, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China Peking Univ, Electron Microscopy Lab, Beijing 100871, Peoples R China Songshan Lake Mat Lab, Dongguan 523808, Peoples R China Peking Univ, Sch Phys, State Key Lab Artificial Microstruct & Mesoscop P, Beijing 100871, Peoples R China Zhejiang Univ, Key Lab Soft Machines & Smart Devices Zhejiang Pr, Hangzhou 310027, Peoples R China |
| Keywords | OXIDE MULTILAYERS DOMAIN ARRAYS FERROELECTRICITY POLARIZATION DYNAMICS ROTATION |
| Issue Date | 11-Aug-2020 |
| Publisher | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
| Abstract | The ability to controllably manipulate complex topological polar configurations such as polar flux-closures via external stimuli may allow the construction of new electromechanical and nanoelectronic devices. Here, using atomically resolved in situ scanning transmission electron microscopy, we find that the polar flux-closures in PbTiO3/SrTiO3 superlattice films are mobile and can be reversibly switched to ordinary single ferroelectric c or a domains under an applied electric field or stress. Specifically, the electric field initially drives movement of a flux-closure via domain wall motion and then breaks it to form intermediate a/c striped domains, whereas mechanical stress first squeezes the core of a flux-closure toward the interface and then form a/c domains with disappearance of the core. After removal of the external stimulus, the flux-closure structure spontaneously recovers. These observations can be precisely reproduced by phase field simulations, which also reveal the evolutions of the competing energies during phase transitions. Such reversible switching between flux-closures and ordinary ferroelectric states provides a foundation for potential electromechanical and nanoelectronic applications. |
| URI | http://hdl.handle.net/20.500.11897/591319 |
| ISSN | 0027-8424 |
| DOI | 10.1073/pnas.2007248117 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 |
