Greatly enhanced microwave absorbing properties of planar anisotropy carbonyl-iron particle composites
Greatly enhanced microwave absorbing properties of planar anisotropy carbonyl-iron particle composites
复制标题
大大增强平面各向异性羰基铁颗粒复合材料的微波吸收性能
DOI：
10.1016/j.jmmm.2014.09.015
复制
发表时间：
2015-02-01
影响因子：
2.7
通讯作者：
Li, Fashen
中科院分区：
文献类型：
--
作者：
Qiao, Liang;Han, Rui;Li, Fashen
本文研究了羰基铁颗粒复合材料在微波波段的高磁导率和高共振频率特性。研究发现，平面各向异性是保持这两种材料高吸波特性的关键因素。测量和计算了平面各向异性羰基铁颗粒/非磁性基质组成的高频有效磁导率。与没有平面各向异性的球形粒子相比，片状粒子的磁导率和共振频率通过引入平面各向异性而大大提高，通过旋转取向方法可以进一步提高磁导率，从而获得更高的平面各向异性。片状软磁粒子由于各向异性或平面各向异性的作用，提高了固有共振频率，从而使磁导率的高实部和虚部在一个较宽的范围内。结合Landau-Lifshitz-Gilbert方程和Bruggeman有效介质理论，模拟了Bake粒子的共振峰。考虑形状系数的修正。我们的理论模拟与实验数据(C)2014爱思唯尔B.V.很好地吻合。
This paper investigates the high permeability and high resonance frequency characteristics of carbonyl-iron particle composites at microwave range. It finds that the key factor to keep both high microwave absorbing characteristics is the planar anisotropy. The effective permeability of planar anisotropy carbonyl-iron particles/nonmagnetic matrix composition in high frequency is measured and calculated. In contrast to the sphere shaped particles with no planar anisotropy, the permeability and resonance frequency of flake particles are greatly enhanced by introducing the planar anisotropy, and the permeability can be further enhanced by using a rotational orientation method to get higher planar anisotropy. As the use or the planar anisotropy, the flake soft magnetic particles increase the natural resonant frequencies so as to lead the higher real part and the imaginary part of the permeability in a broadband range. The resonance peak of Bake particles is simulated by using the combination of the Landau-Lifshitz-Gilbert equation and Bruggeman's effective medium theory. considering the correction of shape factor. Our theory simulation agrees well with the experimental data (C) 2014 Elsevier B.V. All rights reserved.