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Structural and optical properties of epitaxial BaTiO3 thin films grown on GdScO3(110)

2003; American Institute of Physics; Volume: 82; Issue: 20 Linguagem: Inglês

10.1063/1.1575935

1520-8842

J. Schubert, O. Trithaveesak, A. Petraru, Chun‐Lin Jia, R. Uecker, P. Reiche, Darrell G. Schlom,

Ferroelectric and Piezoelectric Materials

We have prepared 1-μm-thick epitaxial BaTiO3 thin films on GdScO3(110) using pulsed laser deposition. The structural perfection of the films was revealed by a rocking curve width of Δω=0.13° for the 002 BaTiO3 reflection and a Rutherford backscattering spectrometry/channeling minimum yield, χmin, of 0.5% measured for the Ba signal behind the surface peak. High-resolution transmission electron microscopy revealed an epitaxial relationship between BaTiO3 and GdScO3 and a sharp interface between the substrate and the film. The refractive index of the BaTiO3 film was no=2.329±0.002 and ne=2.307±0.002 at a wavelength of 632.8 nm and no=2.248±0.002 and ne=2.228±0.002 at a wavelength of 1523 nm. The optical losses were less than 2 dB/cm at a wavelength of 632.8 nm.