Effects of NiFe₂O₄ on magnetoelectric coupling effect of BiFeO₃ thin films

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• 作者：Jianjun Gu ; Shumin Yang ; Wei Yang ; Yunkai Qi ; Guoliang Zhao ; Huiyuan Sun
• 关键词：Magnetoelectric coupling ; Multiferroic ; Electrical and magnetic property
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：January, 2014
• 年：2014
• 卷：349
• 期：Complete
• 页码：140-143
• 全文大小：948 K

文摘

Multiferroic composite thin films with composition (1鈭?em>x)BiFeO₃-xNiFe₂O₄ (x=0.00, 0.10, 0.15, 0.20, 0.25, and 0.30) were prepared by chemical solution deposition(CSD). The results show that with increasing x, the average size of the crystal grains of BiFeO₃ diminishes gradually, and the leakage current density in composite thin films decreases while the remnant polarizations increases. The calculated results for the ferromagnetic contribution of the NiFe₂O₄ indicated that BiFeO₃ also contributed magnetic moment to the composite films. On comparing the grain sizes and magnetic measurement results of the composite thin films with x=0.20 and 0.25, we found that the decreasing crystal grain size of the BiFeO₃ was responsible for ferromagnetism and that the enhanced magnetoelectric coupling effect in composite thin films was also an important factor.