Enhanced polarization and abnormal flexural deformation in bent freestanding perovskite oxides

• DOI: 10.1038/s41467-022-32519-2
• Publication Date: 2022-08-31T10:05:39Z
• Authors: 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; Xiaoqing Pan
• Keywords: Flexoelectricity; Nanoelectromechanical systems; Shrinkage

Abstract Recent realizations of ultrathin freestanding perovskite oxides offer a unique platform to probe novel properties in two-dimensional oxides. Here, we observe giant flexoelectric response BiFeO 3 and SrTiO their bent state arising from strain gradients up 3.5 × 10 7 m −1 , suggesting promising approach for realizing ultra-large polarizations. Additionally, substantial change membrane thickness is discovered which implies an unusual bending-expansion/shrinkage effect the ferroelectric that has never been seen before crystalline materials. Our theoretical model reveals this unprecedented flexural deformation within attributable flexoelectricity–piezoelectricity interplay. The finding unveils intriguing nanoscale electromechanical provides guidance practical applications flexible nanoelectromechanical systems.