Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 312, Issue 2, Pages 414-417Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2006.11.128
Keywords
microwave absorption; ferrite plating; magnetic loss
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Magnetic hollow spheres of low density were prepared by plating Fe3O4 magnetic films on hollow glass spheres using ferrite plating. The complex permeability and permittivity of spheres wax composites were measured in the range of 2-18 GHz. The complex permeability and permittivity increased, and the dielectric and magnetic losses were improved as the volume fraction of the magnetic spheres in the composites increased from 60% to 80%, which also resulted in a great improvement of microwave absorption properties. For composites with volume fraction 80%, its magnetic resonance frequency was at about 13 GHz and it appeared three loss peaks in the calculated reflection loss curves; the bandwidth less than -10 dB was almost 4 GHz which was just in the Ku-band frequencies (12-18 GHz) and a minimum reflection loss of -20 dB was obtained when the thickness was 2.6 mm; the microwave absorbing properties were mainly due to the magnetic loss. The results showed that the magnetic spheres composites were good and light microwave absorbers in the Ku-band frequencies. (c) 2006 Elsevier B.V. All rights reserved.
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