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Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film
Australian Institute for Innovative Materials - Papers
  • Hongyang Zhao, Chinese Academy of Sciences
  • Hideo Kimura, National Institute For Materials Science
  • Zhenxiang Cheng, University of Wollongong
  • Minoru Osada, National Institute for Materials Science
  • Jianli Wang, University of Wollongong
  • Xiaolin Wang, University of Wollongong
  • S X Dou, University of Wollongong
  • Yan Liu, Chinese Academy of Sciences
  • Jianding Yu, Chinese Academy of Sciences
  • Takao Matsumoto, University of Tokyo
  • Tetsuya Tohei, University of Tokyo
  • Naoya Shibata, University of Tokyo
  • Yuichi Ikuhara, University of Tokyo
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Zhao, H., Kimura, H., Cheng, Z., Osada, M., Wang, J., Wang, X., Dou, S., Liu, Y., Yu, J., Matsumoto, T., Tohei, T., Shibata, N. & Ikuhara, Y. (2014). Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film. Scientific Reports, 4 1-8.

Multiferroic materials, which offer the possibility of manipulating the magnetic state by an electric field or vice versa, are of great current interest. However, single-phase materials with such cross-coupling properties at room temperature exist rarely in nature; new design of nano-engineered thin films with a strong magneto-electric coupling is a fundamental challenge. Here we demonstrate a robust room-temperature magneto-electric coupling in a bismuth-layer-structured ferroelectric Bi5Ti3FeO15 with high ferroelectric Curie temperature of ~1000 K. Bi5Ti3FeO15 thin films grown by pulsed laser deposition are single-phase layered perovskit with nearly (00l)-orientation. Room-temperature multiferroic behavior is demonstrated by a large modulation in magneto-polarization and magneto-dielectric responses. Local structural characterizations by transmission electron microscopy and Mössbauer spectroscopy reveal the existence of Fe-rich nanodomains, which cause a short-range magnetic ordering at ~620 K. In Bi5Ti3FeO15 with a stable ferroelectric order, the spin canting of magnetic-ion-based nanodomains via the Dzyaloshinskii-Moriya interaction might yield a robust magneto-electric coupling of ~400 mV/Oe·cm even at room temperature.
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Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Minoru Osada, et al.. "Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film" (2014) p. 1 - 8
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