Effect of misfit strain on the electrocaloric effect of polydomain epitaxial ferroelectric thin films |
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Authors: | Qiu Jian-Hua Ding Jian-Ning Yuan Ning-Yi Wang Xiu-Qin |
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Affiliation: | Center for Low-dimensional Materials, Micro-nano Devices and System, Changzhou University, Changzhou 213164, China |
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Abstract: | The effect of misfit strain on the electrocaloric effect in polydomain epitaxial BaTiO3 thin films at room temperature is investigated using the Ginzburg-Landau-Devonshire thermodynamic theory. Numerical calculations indicate that the misfit strain has a large impact on the ferroelectric polarization states and the electrocaloric effect. Most importantly, the electrocaloric effect in the polydomain ca1/ca2/ca1/ca2 phase is much larger than that in the monodomain c phase and the other polydomain phases. Consequently, a large electrocaloric effect can be obtained by carefully controlling the misfit strain, which may provide potential applications in refrigeration devices. |
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Keywords: | polydomain electrocaloric effect phase transition |
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