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 - Publisher Copyright:
© 2022, This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply.
PY - 2022/12
Y1 - 2022/12
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 - Article
C2 - 36045121
AN - SCOPUS:85137040403
SN - 2041-1723
VL - 13
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 5116
ER -