Tunable negative permittivity and permeability in FeNiMo/Al2O3 composites prepared by hot-pressing sintering
Tunable negative permittivity and permeability in FeNiMo/Al2O3 composites prepared by hot-pressing sintering
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DOI：
10.1016/j.ceramint.2016.01.072
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发表时间：
2016-04
影响因子：
5.2
通讯作者：
Min Chen;Meng Gao;Feng Dang;Ning Wang;Baoqin Zhang;Shi-bing Pan
中科院分区：
文献类型：
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作者：
Min Chen;Meng Gao;Feng Dang;Ning Wang;Baoqin Zhang;Shi-bing Pan
采用热压烧结法制备了不同FeNiMo含量的FeNiMo/ al2o3复合材料。有趣的是，FeNiMo含量为30%的FeNiMo/ al2o3复合材料在860 MHz ~ 1 GHz频率范围内和FeNiMo含量为40%的FeNiMo/ al2o3复合材料在890 MHz ~ 1 GHz频率范围内同时实现了负介电常数和负磁导率。实验结果和理论模拟表明，负磁导率是由畴壁共振和旋磁自旋共振引起的，而负介电常数是由传导电子的等离子体振荡和LC共振引起的。采用Drude模型分析了导电电子等离子体振荡对FeNiMo/ al2o3复合材料负介电常数的影响。拟合结果表明，复合材料的等离子体频率为8.99 GHz。
FeNiMo/Al2O3composites with different FeNiMo content were prepared by hot-pressing sintering. Interestingly, simultaneous negative permittivity and permeability were realized in FeNiMo/Al2O3composites with 30% FeNiMo content in the frequency range of 860 MHz to 1 GHz and in the frequency range of 890 MHz to 1 GHz for composites with 40% FeNiMo content. Experimental results and theoretical simulations indicate that the negative permeability is caused by the domain wall resonance and gyromagnetic spin resonance, while the negative permittivity is attributed to the plasma oscillation of conduction electrons and LC resonance. The negative permittivity of the FeNiMo/Al2O3composite induced by the plasma oscillation of conduction electrons was analyzed using the Drude model. The fitting results indicated that the plasma frequency of the composites was 8.99 GHz.