Magnetic negative permittivity with dielectric resonance in random Fe3O4@graphene-phenolic resin composites
Magnetic negative permittivity with dielectric resonance in random Fe3O4@graphene-phenolic resin composites
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DOI：
10.1007/s42114-017-0014-1
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发表时间：
2018-03
影响因子：
20.1
通讯作者：
Haikun Wu-;Yan Zhang;Rui Yin;Wenling Zhao;Xiaoming Li;Lei Qian
中科院分区：
文献类型：
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作者：
Haikun Wu-;Yan Zhang;Rui Yin;Wenling Zhao;Xiaoming Li;Lei Qian
采用化学共沉淀法和加压法制备了负介电常数的Fe3O4@graphene-phenolic磁性树脂（FGR-PR）复合材料。研究了FGR-PR复合材料的交流电导率、介电常数和磁导率。当FGR含量从84%增加到91%时，观察到明显的渗滤现象。在复合材料中分别观察到两种类型的负介电常数，分别归因于洛伦兹模型和德鲁德模型。由于磁晶各向异性和饱和磁化，当FGR含量从6%增加到98 vol%时，实际磁导率从1.17提高到4.1。此外，磁导率的频散归因于畴壁和自旋磁共振。磁损耗首先在低频处由于自然共振而减小，然后在高频处由于涡流而增大。
Magnetic Fe3O4@graphene-phenolic resin (FGR-PR) composites with negative permittivity were prepared by chemical coprecipitation and pressing method. Alternating current conductivity, permittivity, and permeability of the FGR-PR composites were investigated. An obvious percolation phenomenon was observed with the increase of FGR content from 84 to 91 vol%. Two types of negative permittivity attributed to the Lorentz and the Drude model, respectively, were observed in the composites. Due to the magnetocrystalline anisotropy and saturation magnetization, the real permeability enhanced from 1.17 to 4.1 with the increasing FGR content from 6 to 98 vol%. In addition, the frequency dispersion of permeability was attributed to the domain wall and the gyromagnetic spin resonance. The magnetic loss decreased firstly in the low frequency, attributing to the natural resonance, and then increased in the high frequency from the eddy current.