Ontology type: schema:ScholarlyArticle Open Access: True
2021-10-29
AUTHORSHyunji An, Young-Gyun Choi, Yong-Ryun Jo, Hyo Jin Hong, Jeong-Kyu Kim, Owoong Kwon, Sangmo Kim, Myungwoo Son, Jiwoong Yang, Jun-Cheol Park, Hojoong Choi, Jongmin Lee, Jaesun Song, Moon-Ho Ham, Sangwoo Ryu, Yunseok Kim, Chung Wung Bark, Kyung-Tae Ko, Bong-Joong Kim, Sanghan Lee
ABSTRACTAntiferromagnetic-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. More... »
PAGES69
http://scigraph.springernature.com/pub.10.1038/s41427-021-00335-7
DOIhttp://dx.doi.org/10.1038/s41427-021-00335-7
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