Tunable Negative Permittivity with Fano-like Resonance and Magnetic Property in Percolative Silver/Yittrium Iron Garnet Nanocomposites
Tunable Negative Permittivity with Fano-like Resonance and Magnetic Property in Percolative Silver/Yittrium Iron Garnet Nanocomposites
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渗流银/钇铁石榴石纳米复合材料中具有类法诺共振和磁性的可调负介电常数
DOI：
10.1021/acs.jpcc.7b02036
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发表时间：
2017-03
影响因子：
3.7
通讯作者：
Guo Zhanhu
中科院分区：
文献类型：
--
作者：
Sun Kai;Fan Runhua;Yin Yansheng;Guo Jiang;Li Xiaofeng;Lei Yanhua;An Liqiong;Cheng Chuanbing;Guo Zhanhu
具有负电磁参数的复合材料可能是超材料的有希望的候选者。本文研究了原位合成工艺制备的银/钇铁石榴石（Ag/YIG）复合材料的阻抗、介电常数和磁导率。在渗滤阈值附近，介电损耗主要由传导和极化决定。当达到渗透状态时，观察到具有类法诺共振（不对称共振）的负介电常数。此外，负介电常数行为归因于电感特性，而 LC 谐振则负责从负介电常数到正介电常数的类 Fano 转变。此外，还证明Ag/YIG复合材料的磁导率由于磁畴壁运动和旋磁自旋旋转而呈现频率色散。具有可调负介电常数的渗流Ag/YIG复合材料在电磁衰减领域具有巨大的潜力...
Composites with negative electromagnetic parameters can be promising candidates for metamaterials. In this paper, the impedance, permittivity, and permeability were investigated in the silver/yrrium iron garnet (Ag/YIG) composites, which was fabricated by in situ synthesis process. In the vicinity of the percolation threshold, the dielectric loss is dominated by conduction and polarization. When the percolative state was reached, the negative permittivity with Fano-like renonance (an asymmetric resonance) was observed. Furthermore, the negative permittivity behavior was attributed to inductive character, and the LC resonance was responsible for the Fano-like transition from negative to positve permittivity. In addition, it was demonstrated that the permeability of Ag/YIG composites presented frequency dispersion due to the domain wall motion and the gyromagnetic spin rotation. The percolative Ag/YIG composites with tunable negative permittivity have great potential in the field of electromagnetic attenuat...
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