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In-plane ferroelectricity and enhanced Curie temperature in perovskite BaTiO3 epitaxial thin films
- Source :
- Appl. Phys. Lett.. 117:072902
- Publication Year :
- 2020
- Publisher :
- American Institute of Physics, 2020.
-
Abstract
- 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.
- Subjects :
- 010302 applied physics
Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
02 engineering and technology
021001 nanoscience & nanotechnology
Epitaxy
01 natural sciences
Ferroelectricity
symbols.namesake
Tetragonal crystal system
Lattice constant
0103 physical sciences
symbols
Curie temperature
Orthorhombic crystal system
Thin film
0210 nano-technology
Raman spectroscopy
Subjects
Details
- Language :
- English
- Volume :
- 117
- Database :
- OpenAIRE
- Journal :
- Appl. Phys. Lett.
- Accession number :
- edsair.doi.dedup.....b7e4cbfb4fd6ed67d48bc98ead1b5472