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In-plane ferroelectricity and enhanced Curie temperature in perovskite BaTiO3 epitaxial thin films

Authors :
Mitsuru Itoh
Katsuyoshi Komatsu
Shintaro Yasui
Ippei Suzuki
Tomoyasu Taniyama
Takumi Aoki
Yosuke Hamasaki
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.

Details

Language :
English
Volume :
117
Database :
OpenAIRE
Journal :
Appl. Phys. Lett.
Accession number :
edsair.doi.dedup.....b7e4cbfb4fd6ed67d48bc98ead1b5472