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ABSTRACT
We fabricated a multiferroic BiFeO3 (BFO) film and evaluated its optical properties. A polycrystalline BFO film with a thickness of 650 nm was formed on a Pt/Ti/SiO2/Si substrate. The refractive index of the BFO film was estimated to be approximately 3.0 at a wavelength of 600 nm. This value is the largest in the visible light range for oxide films such as rutile-type TiO2. Furthermore, the extinction coefficient was estimated to be zero in the wavelength range of 600 to 1670 nm. These results suggest that the produced BFO film is a promising material for optical communication devices.
ACKNOWLEDGMENTS
The authors would like to thank Mr. Shinji Iwatsuka (TDK Co., Ltd.) for his support in measuring the optical properties. The authors would also like to thank Dr. Toshiyasu Tadokoro (Techno-Synergy, Inc.), Mr. Michio Suzuki (J. A. Woollam Japan) and Mr. Masahiro Matsuda (J. A. Woollam Japan) for their help in taking measurements with the spectroscopic ellipsometry.