Enhanced polarization and abnormal flexural deformation in bent freestanding perovskite oxides

Songhua Cai (), Yingzhuo Lun, Dianxiang Ji, Peng Lv, Lu Han, Changqing Guo, Yipeng Zang, Si Gao, Yifan Wei, Min Gu, Chunchen Zhang, Zhengbin Gu, Xueyun Wang, Christopher Addiego, Daining Fang, Yuefeng Nie (), Jiawang Hong (), Peng Wang () and Xiaoqing Pan ()
Additional contact information
Songhua Cai: The Hong Kong Polytechnic University
Yingzhuo Lun: Beijing Institute of Technology
Dianxiang Ji: The Hong Kong Polytechnic University
Peng Lv: Beijing Institute of Technology
Lu Han: Nanjing University
Changqing Guo: Beijing Institute of Technology
Yipeng Zang: Nanjing University
Si Gao: Nanjing University
Yifan Wei: Nanjing University
Min Gu: Nanjing University
Chunchen Zhang: Nanjing University
Zhengbin Gu: Nanjing University
Xueyun Wang: Beijing Institute of Technology
Christopher Addiego: University of California
Daining Fang: Beijing Institute of Technology
Yuefeng Nie: Nanjing University
Jiawang Hong: Beijing Institute of Technology
Peng Wang: University of Warwick
Xiaoqing Pan: University of California

Nature Communications, 2022, vol. 13, issue 1, 1-10

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.

Date: 2022
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DOI: 10.1038/s41467-022-32519-2

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