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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Effect of changeable demagnetizing state of ferrite on the permeability of BaTiO_3/Ni_(0.5)Zn_(0.5)Fe_2O_4 composites
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Effect of changeable demagnetizing state of ferrite on the permeability of BaTiO_3/Ni_(0.5)Zn_(0.5)Fe_2O_4 composites

机译：铁氧体变化退磁状态对BaTiO_3 / Ni_（0.5）Zn_（0.5）Fe_2O_4复合材料磁导率的影响

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摘要

A BTO/NZFO ferroelectric/ferromagnetic ceramic composite was prepared by the traditional ceramic method and its permeability was analysed in detail. Results showed that as the BTO fraction increased, the permeability of the composite dropped much more rapidly than that predicted by Kirkpatrick's effective medium model, which was consistent with that usually observed in other ferromagnetic composites. A model was developed to interpret the permeability of ferrite particles with the usual multi-180°-domain structure in the composite by considering both the contributions of spin rotation and domain-wall motion. It was confirmed theoretically that the internal demagnetizing field on the ferrite particles, which was changeable with their shape and dispersion situation, and thus with their fraction, controlled the response of spin rotation and thus the permeability of ferrite particles dispersed in the composite. The rapid decrease in the effective permeability of the composite was ascribed to not only the universal compound effect, formation of defects by ion doping from the coexisting phases and the change in grain size with the ferrite fraction, but also the shielding of the spin rotation response of the ferrite, which depended on its demagnetizing state in the composite.
机译：采用传统的陶瓷方法制备了BTO / NZFO铁电/铁磁陶瓷复合材料，并对其磁导率进行了详细分析。结果表明，随着BTO分数的增加，复合材料的磁导率下降速度比Kirkpatrick有效介质模型所预测的快得多，这与在其他铁磁复合材料中通常观察到的一致。通过考虑自旋旋转和畴壁运动的贡献，开发了一个模型来解释复合物中通常具有多180°畴结构的铁氧体颗粒的磁导率。从理论上证实，铁氧体颗粒上的内部退磁场随其形状和分散情况以及分数而变化，从而控制了自旋旋转的响应，从而控制了分散在复合物中的铁氧体颗粒的磁导率。复合材料有效渗透率的迅速下降不仅归因于通用化合物效应，共存相中离子掺杂形成的缺陷以及晶粒尺寸随铁素体含量的变化，还归因于自旋旋转响应的屏蔽。铁氧体的磁导率取决于其在复合材料中的退磁状态。

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