Enhanced polarization and abnormal flexural deformation in bent freestanding perovskite oxides.

Cai, Songhua; Lun, Yingzhuo; Ji, Dianxiang; Lv, Peng; Han, Lu; Guo, Changqing; Zang, Yipeng; Gao, Si; Wei, Yifan; Gu, Min; Zhang, Chunchen; Gu, Zhengbin; Wang, Xueyun; Addiego, Christopher; Fang, Daining; Nie, Yuefeng; Hong, Jiawang; Wang, Peng; Pan, Xiaoqing

Cai, Songhua; Lun, Yingzhuo; Ji, Dianxiang; Lv, Peng; Han, Lu; Guo, Changqing; Zang, Yipeng; Gao, Si; Wei, Yifan; Gu, Min; Zhang, Chunchen; Gu, Zhengbin; Wang, Xueyun; Addiego, Christopher; Fang, Daining; Nie, Yuefeng; Hong, Jiawang; Wang, Peng; Pan, Xiaoqing.

Affiliation

Cai S; Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong. songhua.cai@polyu.edu.hk.
Lun Y; School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Ji D; Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong.
Lv P; School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Han L; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Guo C; School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Zang Y; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Gao S; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Wei Y; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Gu M; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Zhang C; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Gu Z; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Wang X; School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Addiego C; Department of Physics and Astronomy, University of California, Irvine, CA, 92697, USA.
Fang D; Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China.
Nie Y; State Key Laboratory for Turbulence and Complex Systems & Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing, 100871, China.
Hong J; National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China. ynie@nju.edu.cn.
Wang P; School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China. hongjw@bit.edu.cn.
Pan X; Department of Physics, University of Warwick, Coventry, CV4 7AL, UK. peng.wang.3@warwick.ac.uk.

Nat Commun ; 13(1): 5116, 2022 Aug 31.

Article in En | MEDLINE | ID: mdl-36045121

ABSTRACT

ABSTRACT

Recent realizations of ultrathin freestanding perovskite oxides offer a unique platform to probe novel properties in two-dimensional oxides. Here, we observe a giant flexoelectric response in freestanding BiFeO3 and SrTiO3 in their bent state arising from strain gradients up to 3.5 × 107 m-1, suggesting a promising approach for realizing ultra-large polarizations. Additionally, a substantial change in membrane thickness is discovered in bent freestanding BiFeO3, which implies an unusual bending-expansion/shrinkage effect in the ferroelectric membrane that has never been seen before in crystalline materials. Our theoretical model reveals that this unprecedented flexural deformation within the membrane is attributable to a flexoelectricity-piezoelectricity interplay. The finding unveils intriguing nanoscale electromechanical properties and provides guidance for their practical applications in flexible nanoelectromechanical systems.

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Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Guideline / Prognostic_studies Language: En Journal: Nat Commun Year: 2022 Document type: Article

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