Effects of annealing temperature on the structures,ferroelectric and magnetic properties of Aurivillius Bi5Ti3FeO15 polycrystalline films |
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| Authors: | W Bai JY Zhu JL Wang T Lin J Yang XJ Meng XD Tang ZQ Zhu JH Chu |
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| Institution: | 1. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241, PR China;2. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Science, Shanghai 200083, PR China |
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| Abstract: | The effects of annealing temperature on the structures, ferroelectric and magnetic properties of Aurivillius layer-structured Bi5Ti3FeO15 (BTF) films were investigated. It was found that an annealing temperature above 625 °C can lead to the appearance of Bi4Ti3O12 (BiT) secondary phase on Pt substrates. The reduction of the grain sizes was simultaneously confirmed by X-ray diffraction and atomic force microscopy with the introduction of the BiT phase. Moreover, the remanent polarization and coercive field of the BTF films were dramatically enhanced with the introduction of the BiT phase. Improved ferromagnetism for the BTF films was demonstrated upon increasing annealing temperature. Our data indicated that the ferroelectricity strongly correlated with the growth orientation of the BTF films. Finally, the possible factors for the obvious increase of the remanent polarization and coercive field, and the possible reasons for the enhanced ferromagnetic properties were discussed with increasing annealing temperature. |
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| Keywords: | Aurivillius compound Multiferroic property Annealing temperature |
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