Multiferroic properties of solben gel derived Bi5Fe1-xCoxTi3O15 thin films |
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Authors: | Wang Wei Wu Xin-Hu Mao Xiang-Yu Chen Xiao-Bing |
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Affiliation: | College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, Chinavspace1pt;College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, Chinavspace1pt;College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, Chinavspace1pt;College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, Chinavspace1pt |
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Abstract: | Co-doped Bi5FeTi3O15 thin films (BFCT-x, Bi5Fe1-xCoxTi3O15) were prepared using a sol—gel technique. XRD patterns confirm their single phase Aurivillius structure, and the corresponding powder Rietveld analysis indicates the change of space group around x=0.12. The magnetic hysteresis loops are obtained and ferromagnetism is therefore confirmed in BFCT-x thin films. The remanent magnetization (Mr) first increases and reaches the maximum value of 0.42 emu/cm3 at x=0.12 due to the possible Fe3+—O—Co3+ ferromagnetic coupling. When x = 0.25, the Mr increases again because of the dominant Fe3+—O—Co3+ ferromagnetic coupling. The remanent polarization (2Pr) of BFCT-0.25 was measured to be as high as 62 μC/cm2, a 75% increase when compared with the non-doped BFCT-0 films. The 2Pr remains almost unchanged after being subjected to 5.2 × 109 read/write cycles. Greatly enhanced ferroelectric properties are considered to be associated with decreased leakage current density. |
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Keywords: | magnetism ferroelectricity thin film |
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