Linear magnetic field dependence of the magnetodielectric effect in eutectic BaTiO3-CoFe2O4 multiferroic material fabricated by containerless processing
Linear magnetic field dependence of the magnetodielectric effect in eutectic BaTiO3-CoFe2O4 multiferroic material fabricated by containerless processing
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DOI：
10.1063/1.5025072
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发表时间：
2018-05
影响因子：
4
通讯作者：
J. Fukushima;K. Ara;T. Nojima;S. Iguchi;Y. Hayashi;H. Takizawa
中科院分区：
文献类型：
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作者：
J. Fukushima;K. Ara;T. Nojima;S. Iguchi;Y. Hayashi;H. Takizawa
为了最大限度地在磁致伸缩相和电致伸缩相之间形成各向异性界面，采用无容器工艺制备了共晶BaTiO3-CoFe2O4多铁性材料。该工艺制备的复合材料具有良好的共晶结构，特别是在共晶组成为BaTiO3:CoFe2O4 = 62:38时。TEM观察发现，四边形BaTiO3的（1 0 0）面与CoFe2O4的（1 0 0）面取向平行。除了共晶成分样品中最大的磁介电效应外，我们还证实了通过施加强磁场通过强制磁致伸缩来线性控制介电常数。到目前为止，磁介电效应在0.25 T左右的峰值只出现在烧结的CoFe2O4多晶样品中。因此，无容器加工为我们提供了一条不伴随90°畴壁过程和旋转磁化过程而产生理想微观结构的途径，从而增强了磁介电效应。为了最大限度地在磁致伸缩相和电致伸缩相之间形成各向异性界面，采用无容器工艺制备了共晶BaTiO3-CoFe2O4多铁性材料。该工艺制备的复合材料具有良好的共晶结构，特别是在共晶组成为BaTiO3:CoFe2O4 = 62:38时。TEM观察发现，四边形BaTiO3的（1 0 0）面与CoFe2O4的（1 0 0）面取向平行。除了共晶成分样品中最大的磁介电效应外，我们还证实了通过施加强磁场通过强制磁致伸缩来线性控制介电常数。到目前为止，磁介电效应在0.25 T左右的峰值只出现在烧结的CoFe2O4多晶样品中。因此，无容器加工为我们提供了一条不伴随90°畴壁过程和旋转磁化过程而产生理想微观结构的途径，从而提高了材料的磁介电性能。
To maximize the formation of an anisotropic interface between the magnetostrictive phase and the electrostrictive phase, a eutectic BaTiO3-CoFe2O4 multiferroic material is fabricated by containerless processing. The composites in this process had a fine eutectic structure, especially at a eutectic composition of BaTiO3:CoFe2O4 = 62:38. TEM observations revealed that the (1 0 0) plane of tetragonal BaTiO3 and the (1 0 0) plane of CoFe2O4 were oriented in parallel. In addition to the largest magnetodielectric effect in the eutectic-composition samples, we confirmed the permittivity is controlled linearly by applying a high magnetic field through forced magnetostriction. So far, the peak of the magnetodielectric effect around 0.25 T has been only found in the sintered CoFe2O4 polycrystalline sample. Thus, the containerless processing provides us a route to produce an ideal microstructure without accompanying 90° domain wall process and rotational magnetization process, which enhances the magnetodielectric effect.To maximize the formation of an anisotropic interface between the magnetostrictive phase and the electrostrictive phase, a eutectic BaTiO3-CoFe2O4 multiferroic material is fabricated by containerless processing. The composites in this process had a fine eutectic structure, especially at a eutectic composition of BaTiO3:CoFe2O4 = 62:38. TEM observations revealed that the (1 0 0) plane of tetragonal BaTiO3 and the (1 0 0) plane of CoFe2O4 were oriented in parallel. In addition to the largest magnetodielectric effect in the eutectic-composition samples, we confirmed the permittivity is controlled linearly by applying a high magnetic field through forced magnetostriction. So far, the peak of the magnetodielectric effect around 0.25 T has been only found in the sintered CoFe2O4 polycrystalline sample. Thus, the containerless processing provides us a route to produce an ideal microstructure without accompanying 90° domain wall process and rotational magnetization process, which enhances the magnetodielectric ef...