Ferroelectric and magnetic properties of multiferroic BiFeO(3)-based composite films.
BiFeO(3)-based composite films were fabricated onto the Pt/Ti/SiO(2)/Si(100) substrates by a chemical solution deposition (CSD) method using the precursor solutions with various excess iron composition followed by annealing at 923 K for 30 minutes under oxygen gas flow. Coexistence of spontaneous magnetization and remanent polarization could be obtained in the BiFeO(3)-based composite films with high excess iron composition. The remanent magnetization of almost 20 emu/cm(3) and the magnetic coercive field of 1.5 kOe were obtained at the iron composition ratio of Fe/Bi = 1.25. In this specimen, the remanent polarization at 90 K was approximately 10 microC/cm(2) at the electric field of 1500 kV/cm. Structural analysis suggested that the remanent polarization has a possibility to increase by suppressing the formation of the secondary phases of Bi(2)Fe(4)O(9) and alpha-Fe(2)O(3), these are the nonferroelectric material as well as antiferromagnetic phase.
Department of Applied Physics Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan. naganuma@rs.kagu.tus.ac.jp
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Naganuma
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Okubo
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Kamishima
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Kakizaki
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Hiratsuka
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Okamura
D001729:Bismuth / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D005290:Ferric Compounds / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D008567:Membranes, Artificial; D013696:Temperature
D005290:Ferric Compounds; D008567:Membranes, Artificial; C000499:ferric oxide; C033301:bismuth oxide; D001729:Bismuth