Multiferroic properties of sol–gel derived Bi5Fe1-xCoxTi3O15 thin films

doi:10.1088/1674-1056/20/7/077701

Abstract Co-doped Bi$_{5}$FeTi$_{3}$O$_{15}$ thin films (BFCT-$x$, Bi$_{5}$Fe$_{1-x}$Co$_{x}$Ti$_{3}$O$_{15}$) 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 ($M_{\rm r}$) first increases and reaches the maximum value of 0.42 emu/cm$^{3}$ at $x=0.12$ due to the possible Fe$^{3+}$--O--Co$^{3+}$ ferromagnetic coupling. When $x = 0.25$, the $M_{\rm r}$ increases again because of the dominant Fe$^{3+}$--O--Co$^{3+}$ ferromagnetic coupling. The remanent polarization ($2P_{\rm r}$) of BFCT-0.25 was measured to be as high as 62 $\mu $C/cm$^{2}$, a 75% increase when compared with the non-doped BFCT-0 films. The $2P_{\rm r}$ remains almost unchanged after being subjected to $5.2\times 10^{9}$ read/write cycles. Greatly enhanced ferroelectric properties are considered to be associated with decreased leakage current density.

Keywords: magnetism ferroelectricity thin film

Received: 30 September 2010
Revised: 01 March 2011
Accepted manuscript online:

PACS:	77.84.-s	(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
	78.30.-j	(Infrared and Raman spectra)
	73.50.-h	(Electronic transport phenomena in thin films)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51072177 ) and the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China (Grant No. 08KJB140011).

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Wang Wei(王伟), Wu Xin-Hua(武鑫华), Mao Xiang-Yu(毛翔宇), and Chen Xiao-Bing(陈小兵) Multiferroic properties of sol–gel derived Bi₅Fe_1-xCo_xTi₃O₁₅ thin films 2011 Chin. Phys. B 20 077701

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Multiferroic properties of sol–gel derived Bi5Fe1-xCoxTi3O15 thin films

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Multiferroic properties of sol–gel derived Bi₅Fe_1-xCo_xTi₃O₁₅ thin films