期刊
PHYSICA B-CONDENSED MATTER
卷 406, 期 20, 页码 3896-3900出版社
ELSEVIER
DOI: 10.1016/j.physb.2011.07.019
关键词
Sendust; Complex permeability; Microwave absorption; Planar anisotropy
资金
- Fundamental Research Funds for the Central Universities [lzujbky-2010-71]
The microwave permeability dispersion behaviors and microwave-absorbing properties for different shapes of Sendust particles prepared by vibrating ball milling at 35 vol% in paraffin wax matrix have been investigated. The dispersion spectrum of permeability was calculated by the Landau-Lifshitz-Gilbert equation and Bruggeman's effective medium theory. The calculated results are in agreement with the experiment data. According to the calculation results, the value of (mu(0) - 1)f(r) (mu(0) is static permeability, and f(r) is resonance frequency) for flake particle with larger aspect ratio reached 59.1 GHz and exceeded the Snoek's limit. Considering the quarter-wavelength model and transmission line theory, the microwave absorption peak was discussed. At the frequency range, the flake particle with larger aspect ratio can make a thinner absorber. It provides away to decrease layer thickness of magnetic absorber. (C) 2011 Elsevier B.V. All rights reserved.
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