Journal
PHYSICA B-CONDENSED MATTER
Volume 404, Issue 20, Pages 3567-3570Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2009.06.001
Keywords
Microwave absorption; Complex magnetic permeability; Reflection loss; Iron-based powder
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Funding
- National Natural Science Foundation of China [90505007]
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The microwave-absorbing properties for different shapes of carbonyl-iron particles prepared by the high-energy planetary ball milling with 40vol% in epoxy resin matrix have been investigated. Higher value of magnetic permeability and permittivity can be obtained in the composites for thin flake carbonyl iron than spherical powders. The results are attributed to reduction of eddy current loss, orientation of magnetic moment and space-charge polarization with the shape change from spherical powders to thin flake particles. As the iron flakes with 0.4 mu m in thickness as the absorbent fillers, the minimum RL value of -6.20 dB was observed at 4.57 GHz with thickness of 1 mm. The minimum reflection loss (RL) shifts to lower frequency and the value declines with change from spherical powders to thin flakes. It results from the considerable dielectric loss in the absorbing materials. (C) 2009 Elsevier B.V. All rights reserved.
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