The negative permittivity behavior and magnetic property of FeNi/Al2O3 composites in radio frequency region
The negative permittivity behavior and magnetic property of FeNi/Al2O3 composites in radio frequency region
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DOI：
10.1016/j.ceramint.2016.09.064
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发表时间：
2016-12
影响因子：
5.2
通讯作者：
Zidong Zhang;Kai Sun;Yao Liu;Zhaoyu Kuang;Suyang Sun;X. Ji
中科院分区：
文献类型：
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作者：
Zidong Zhang;Kai Sun;Yao Liu;Zhaoyu Kuang;Suyang Sun;X. Ji
负电磁参数材料因其具有负折射率、理想透镜等特性而成为研究热点。在射频下研究了介电常数和磁导率。当FeNi含量超过逾渗阈值时，FeNi含量为30 vol%的FeNi/Al 2 O3复合材料呈现负介电常数谱，表明材料处于低频等离子体状态，这可以用Drude模型解释。同时，随着FeNi含量的增加，磁谱呈现出明显的弛豫特征。
Negative electromagnetic parameters materials have become a research hotspot due to their interesting properties, such as negative refractive index, perfect lens, etc. In this paper, FeNi/Al2O3composites with different FeNi content were prepared via a hot-pressing process. The permittivity and permeability have been studied at radio frequency. When the FeNi content exceeds the percolation threshold, the FeNi/Al2O3composite with 30 vol% FeNi content shows negative permittivity spectra indicating the low frequency plasmonic state, which can be explained by the Drude model. Meanwhile, the magnetic spectra presents obvious relaxation characteristic with the increase of FeNi content.