TY - JOUR
T1 - Large refractive index in BiFeO3-BiCoO3 epitaxial films
AU - Shima, Hiromi
AU - Nishida, Ken
AU - Yamamoto, Takashi
AU - Tadokoro, Toshiyasu
AU - Tsutsumi, Koichi
AU - Suzuki, Michio
AU - Naganuma, Hiroshi
N1 - Funding Information:
This work was partly supported by “Foundation for Promotion of Material Science and Technology of Japan (MST Foundation),” Grant-in-Aid for challenging Exploratory Research (Grant No. 23656025), Strategic International Cooperative Program (Joint Research Type), Japan Science and Technology Agency “Advanced Spintronic Materials and Transport Phenomena (ASPIMATT),” and NEDO Grant.
PY - 2013/5/7
Y1 - 2013/5/7
N2 - Rhombohedral (R-) and tetragonal (T-) Bi(Fe,Co)O3 (BFCO) films were epitaxially grown on the SrTiO3 (100) substrates, and the optical properties of the BFCO films were evaluated by spectroscopic ellipsometry. It was revealed that the refractive indexes of R- and T-BFCO epitaxial films were 2.93 and 2.86 at wavelength of 600 nm, and 2.65 and 2.59 at 1550 nm, respectively, which are comparable to the pure BiFeO3. The refractive index of the R-BFCO film was totally larger than that of the T-BFCO film; it might be caused by structural strain and local symmetry breaking. It was confirmed that the extinction coefficients of both films were almost zero at wavelengths larger than 600 nm. In addition, the optical band gaps of the R- and T-BFCO films were estimated to be 2.78 and 2.75 eV, respectively. It can expect that the BFCO film has a possibility to use optical-magnetic field sensor working at room temperature.
AB - Rhombohedral (R-) and tetragonal (T-) Bi(Fe,Co)O3 (BFCO) films were epitaxially grown on the SrTiO3 (100) substrates, and the optical properties of the BFCO films were evaluated by spectroscopic ellipsometry. It was revealed that the refractive indexes of R- and T-BFCO epitaxial films were 2.93 and 2.86 at wavelength of 600 nm, and 2.65 and 2.59 at 1550 nm, respectively, which are comparable to the pure BiFeO3. The refractive index of the R-BFCO film was totally larger than that of the T-BFCO film; it might be caused by structural strain and local symmetry breaking. It was confirmed that the extinction coefficients of both films were almost zero at wavelengths larger than 600 nm. In addition, the optical band gaps of the R- and T-BFCO films were estimated to be 2.78 and 2.75 eV, respectively. It can expect that the BFCO film has a possibility to use optical-magnetic field sensor working at room temperature.
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U2 - 10.1063/1.4794878
DO - 10.1063/1.4794878
M3 - Article
AN - SCOPUS:84877737051
SN - 0021-8979
VL - 113
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 17
M1 - 17A914
ER -