Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 489, Issue 1, Pages 297-303Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2009.09.077
Keywords
Nickel ferrite; Nanocomposites; Cavity perturbation; Complex permittivity; Complex permeability; Microwave absorber
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Funding
- Kerala State Council for Science, Technology and Environment [(T)/159/SRS/2004/CSTE]
- All India Council for Technical Education [8023/RID-73/2004-05]
- University Grants Commission [C2/RFSMS/1199/07]
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Flexible magnetic composite materials were prepared by incorporating precharacterized nickel ferrite nanoparticles in a natural rubber matrix. The complex dielectric permittivity and magnetic permeability of the composites were measured at different microwave frequencies using the cavity perturbation technique. A steady increase in dielectric permittivity was observed with increase in filler concentration. Maxwell-Garnett mixture equations were employed to model the effective permittivity and permeability of the composite. Reflection loss was estimated by employing the model of single layer absorber backed with a perfect conductor. Reflection loss minima of -5.9 dB at 3.2 GHz for 12 mm thick rubber ferrite composite sheet is obtained in the S-band while a loss up to -16 dB could be achieved at 9.5 GHz in the X-band. (C) 2009 Elsevier B.V. All rights reserved.
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