TY - JOUR
T1 - Enhanced polarization and abnormal flexural deformation in bent freestanding perovskite oxides
AU - Cai, Songhua
AU - Lun, Yingzhuo
AU - Ji, Dianxiang
AU - Lv, Peng
AU - Han, Lu
AU - Guo, Changqing
AU - Zang, Yipeng
AU - Gao, Si
AU - Wei, Yifan
AU - Gu, Min
AU - Zhang, Chunchen
AU - Gu, Zhengbin
AU - Wang, Xueyun
AU - Addiego, Christopher
AU - Fang, Daining
AU - Nie, Yuefeng
AU - Hong, Jiawang
AU - Wang, Peng
AU - Pan, Xiaoqing
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (grant: 11874199, 11861161004, 11774153), the International Cooperation and Exchange Program by NSFC (11911530174), and the Fundamental Research Funds for the Central Universities (020514380224, 14380167). J.W.H. acknowledges support from the National Science Foundation of China (grant 12172047), Beijing Natural Science Foundation (Z190011), and the Technological Innovation Project of Beijing Institute of Technology. S.H.C. acknowledges the support of the General Research Fund (No. 15306021) from the Hong Kong Research Grants Council, the National Natural Science Foundation of China (Grant No. 12104381), the startup grants from the Department of Applied Physics, the Hong Kong Polytechnic University (Grant No. 1-BD96), Research Grants Council of Hong Kong (Project no. C5029-18E) and the open subject of National Laboratory of Solid State Microstructures, Nanjing University (M34001). C.A. and X.Q.P. acknowledge support from the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Science and Engineering (DE-SC0014430). D.X.J. acknowledges the startup grant from the Department of Applied Physics, the Hong Kong Polytechnic University, Research Grants Council of Hong Kong (Grant No. 1-BD6B) and the open subject of National Laboratory of Solid State Microstructures, Nanjing University (M34028). Y.Z.L. is supported by Graduate Technological Innovation Project of Beijing Institute of Technology (grant 2019CX20002). P.L. is supported by the China Postdoctoral Science Foundation (Grant No. 2022M711048). Theoretical calculations were performed using resources of the Supercomputer Centre in Chongqing.
Publisher Copyright:
© 2022, This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply.
PY - 2022/8
Y1 - 2022/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85137040403&partnerID=8YFLogxK
U2 - 10.1038/s41467-022-32519-2
DO - 10.1038/s41467-022-32519-2
M3 - Journal article
C2 - 36045121
AN - SCOPUS:85137040403
SN - 2041-1723
VL - 13
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 5116
ER -