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Ferroelectric properties and the origin of the magnetism in the Bi6Fe2Ti3O18 thin films

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Abstract

The Fe-containing Aurivillius phase Bi6Fe2Ti3O18 (BFFT) thin films were successfully prepared using the chemical solution deposition technique. The microstructure, ferroelectricity, and magnetic properties were investigated. A defined hysteresis loop was obtained with the remnant polarization (2P r) 22.6 μC/cm2 at 2 kHz under the electric field ~600 kV/cm. The frequency dependence of hysteresis loops was also studied to exclude contribution of the leakage current to polarization in BFFT thin film. Furthermore, the electromechanical responses of the films were investigated using piezoresponse force microscopy. These results indicate the intrinsic ferroelectricity in the present BFFT films. It was found that the BFFT film shows room-temperature weak ferromagnetism with the saturated magnetization (M s) ~2.9 emu/cm3. To explore the origin of the observed weak ferromagnetism, the magnetism of the same stoichiometric ceramics and the films was compared. The BFFT ceramics show antiferromagnetic interaction background, while the magnetism of the BFFT film may originate from the spin canting of the coupling of the Fe3+-based and Fe2+-based sublattices. The existence of Fe2+ ions in the BFFT films was also proved by the XPS spectrum.

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Acknowledgements

This work was supported by the National Science Foundation of China (Grant Nos. 51402256 and 11374227) and Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (Grant No. 12KJB140013).

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Authors and Affiliations

  1. College of Physics Science and Technology, Yangzhou University, Yangzhou, 225002, China

    Hui Sun, Baowen Zou, Xiaoran Ni, Xiangyu Mao & Xiaobing Chen

  2. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China

    Jinsong Zhu

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  1. Hui Sun
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  2. Baowen Zou
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  4. Xiangyu Mao
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Correspondence to Xiaobing Chen.

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Sun, H., Zou, B., Ni, X. et al. Ferroelectric properties and the origin of the magnetism in the Bi6Fe2Ti3O18 thin films. J Mater Sci 50, 5475–5481 (2015). https://doi.org/10.1007/s10853-015-9093-y

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  • DOI: https://doi.org/10.1007/s10853-015-9093-y

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