Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1799470 | Journal of Magnetism and Magnetic Materials | 2015 | 6 Pages |
Abstract
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 of 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 flake 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Liang Qiao, Rui Han, Tao Wang, Liyun Tang, Fashen Li,