In-plane ferroelectricity and enhanced Curie temperature in perovskite BaTiO3 epitaxial thin films
In-plane ferroelectric polarization in BaTiO3 (BTO) epitaxial thin films on MgAl2O4(001) (MAO) is reported. The directional dependence of both in-plane polarization curves and Raman spectroscopy shows that the films have an orthorhombic structure at room temperature, in contrast to the tetragonal st...
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Veröffentlicht in: | Applied physics letters 2020-08, Vol.117 (7) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In-plane ferroelectric polarization in BaTiO3 (BTO) epitaxial thin films on MgAl2O4(001) (MAO) is reported. The directional dependence of both in-plane polarization curves and Raman spectroscopy shows that the films have an orthorhombic structure at room temperature, in contrast to the tetragonal structure of the corresponding bulk. The largest in-plane polarization value among BTO-based tensile-strained films is obtained. The temperature dependence of the lattice constants shows that the Curie temperature of the thin films is as high as
220
°C, which is higher than that of the bulk by
100
°C. The significant enhancement of the Curie temperature is attributed to high-quality coherent epitaxial growth due to perfect matching between the lattice parameter of the
c-axis of BTO and that of MAO. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/5.0013484 |