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Downward self‐polarization of lead‐free (K0.5Na0.5)(Mn0.005Nb0.995)O3 ferroelectric thin films on Nb:SrTiO3 substrate |
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| Authors: | Hae Jin Seog Chang Won Ahn Shinuk Cho Kwang‐Eun Kim Chan‐Ho Yang Tae Yeong Koo Sun‐Young Lee Jong Pil Kim Ill Won Kim |
| Affiliation: | 1. Department of Physics and Energy Harvest‐Storage Research Center, University of Ulsan, Ulsan, Republic of Korea;2. Department of Physics, KAIST, Daejion, Republic of Korea;3. Pohang Accelerator Laboratory, Pohang, Gyungbuk, Republic of Korea;4. Division of Analysis and Research, Korea Basic Science Institute, Busan, Republic of Korea |
| Abstract: | Spontaneously appearing macroscopic polarization (self‐polarization) in ferroelectrics without an electrode or an external electric field would enable the freedom to design many ferroelectric heterostructures and devices. The (K0.5Na0.5)(Mn0.005Nb0.995)O3 (KNMN) thin film was grown on Nb:SrTiO3 single‐crystal substrate and the resultant self‐polarization behavior due to strain relaxation was investigated. The lattice mismatch and difference in TEC between the KNMN thin film and the Nb:SrTiO3 substrate creates a compressive strain. The compressive strain gradient may be the main cause for the observed downward self‐polarization. The downward self‐polarization of the KNMN thin film can be explained by the strong inhomogeneous compressive strain caused by strain relaxation. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) |
| Keywords: | lead‐free ferroelectrics self‐polarization (K,Na)NbO3 thin films strain |