Experimental realization of strain-induced room-temperature ferroelectricity in SrMnO3 films via selective oxygen annealing
- Authors
- An, Hyunji; Choi, Young-Gyun; Jo, Yong-Ryun; Hong, Hyo Jin; Kim, Jeong-Kyu; Kwon, Owoong; Kim, Sangmo; Son, Myungwoo; Yang, Jiwoong; Park, Jun-Cheol; Choi, Hojoong; Lee, Jongmin; Song, Jaesun; Ham, Moon-Ho; Ryu, Sangwoo; Kim, Yunseok; Bark, Chung Wung; Ko, Kyung-Tae; Kim, Bong-Joong; Lee, Sanghan
- Issue Date
- Dec-2021
- Publisher
- Nature Research
- Citation
- NPG Asia Materials, v.13, no.1
- Journal Title
- NPG Asia Materials
- Volume
- 13
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/82778
- DOI
- 10.1038/s41427-021-00335-7
- ISSN
- 1884-4049
- Abstract
- Antiferromagnetic-paraelectric SrMnO3 (SMO) has aroused interest because of the theoretical strong coupling between the ferroelectric and ferromagnetic states with increasing epitaxial strain. In strained SMO films, the <110> polarized state and polar distortions have been observed, although high leakage currents and air degradation have limited their experimental verification. We herein provide a conclusive demonstration of room-temperature ferroelectricity and a high dielectric constant (εr = 138.1) in tensile-strained SMO by securing samples with insulating properties and clean surfaces using selective oxygen annealing. Furthermore, a paraelectricity and low dielectric constant (εr = 6.7) in the strain-relaxed SMO film have been identified as properties of the bulk SMO, which directly proves that the ferroelectricity of the tensile-strained SMO film is due to strain-induced polarization. We believe that these findings not only provide a cornerstone for exploring the physical properties of multiferroic SMO but also inspire new directions for single-phase multiferroics. © 2021, The Author(s).
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