Strong magnetoelectric coupling in CoFe₂O₄–BaTiO₃ composites prepared by molten-salt synthesis method

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• 作者：Junwu Nie ; Guoyue Xu ; Ying Yang ; Chuanwei Cheng
• 关键词：Nanostructures ; Interface ; Chemical synthesis ; Hysteresis
• 刊名：Materials Chemistry and Physics
• 出版年：2009
• 出版时间：15 May 2009
• 年：2009
• 卷：115
• 期：1
• 页码：400-403
• 全文大小：535 K

文摘

Magnetoelectric nano-composites (1 − x)CoFe₂O₄ + (x)BaTiO₃ with x varies as 0, 0.5, 0.65 and 1.0 in molar ratio were prepared by molten-salt synthesis method. The structural analysis carried out by X-ray diffraction (XRD) technique has confirmed that both phases are present in all the nano-composites powders and ceramic composites. The TEM images show that the nano-particle crystallite size is about 50–80 nm, which is consistent to the result calculated by XRD. The dielectric constant was studied as a function of frequency for ceramic composites sintered by using those nano-composite powders. The saturation magnetization (Ms) and remnant polarization (Pr) were calculated from the magnetic hysteresis loop and electric hysteresis loop, respectively. And a large ME coefficient of about 17.04 mV cm⁻¹ Oe⁻¹ was observed for 0.5CoFe₂O₄ + 0.5BaTiO₃ ME composite under the ac superimposed magnetic signal with 20 kHz frequency by using the lock-in technique.