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)
Hauptverfasser: Komatsu, Katsuyoshi, Suzuki, Ippei, Aoki, Takumi, Hamasaki, Yosuke, Yasui, Shintaro, Itoh, Mitsuru, Taniyama, Tomoyasu
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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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0013484