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Title: | Room-temperature electric field-induced out-of-plane ferroelectric polarization in strain-free freestanding 2D SrTiO₃ membranes | Authors: | Zhang, Y Li, J Yang, K Zheng, F Zhou, Y Zhang, Y Hui, Y Wang, YQ Zhu, J Zhang, J Hao, Y Yang, M Li, T Zhao, J Ma, HH |
Issue Date: | Apr-2023 | Source: | APL materials, Apr. 2023, v. 11, no. 4, 041103, p. 041103-1 - 041103-8 | Abstract: | SrTiO3 (STO), a room-temperature paraelectric material in bulk form, has been a rich playground for emergent phenomena for decades. As an emerging material, great attention has been paid to freestanding 2D STO thin films. Recently, the room-temperature ferroelectricity has been unveiled in strained STO thin films; however, it remains an open question whether the strain-free freestanding 2D STO thin film is room-temperature ferroelectric or not. Here, we report the electric field-induced out-of-plane ferroelectric polarization in large-scale, freestanding, and strain-free 2D STO membranes at room temperature. High-resolution piezoresponse force microscopy measurements show that polarization in freestanding strain-free STO membranes can be switched by electric field and persist for an hour. The first-principles calculations suggest that the intrinsic defects such as oxygen vacancies could be linked to the observed spontaneous out-of-plane polarization in 2D STO membranes, which could be further enhanced by external electric field due to the induced symmetry breaking. Our work reports the unprecedented room-temperature ferroelectric polarization in strain-free freestanding 2D STO membranes, unlocking the great potential of freestanding 2D STO for the applications in novel electronic and logic-in-memory devices. | Publisher: | AIP Publishing LLC | Journal: | APL materials | EISSN: | 2166-532X | DOI: | 10.1063/5.0144758 | Rights: | © 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). The following publication Yueying Zhang, Jiaming Li, Ke Yang, Fangyuan Zheng, Yuqing Zhou, Yuguo Zhang, Yupeng Hui, Yue-Qi Wang, Jiang Zhu, Jincheng Zhang, Yue Hao, Ming Yang, Tao Li, Jiong Zhao, Haijiao Harsan Ma; Room-temperature electric field-induced out-of-plane ferroelectric polarization in strain-free freestanding 2D SrTiO3 membranes. APL Mater. 1 April 2023; 11 (4): 041103 is available at https://doi.org/10.1063/5.0144758. |
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