Negative permeability spectra in Permalloy granular composite materials
- 24 April 2006
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 88 (17) , 172502
- https://doi.org/10.1063/1.2198113
Abstract
Complex permeability spectra of Permalloy granular composite materials have been studied in the microwave frequency range. The heat-treated Permalloy particles in the air at several hundreds of °C have a high surface electrical resistance; the eddy current effect in the high frequency permeability spectra can be suppressed in the composite structure containing the percolated particles. A negative permeability has been obtained above 5 GHz due to the natural magnetic resonance in the 70 vol % particle content composite material. In this content, electrical permittivityspectra show a nonmetallic characteristic. This permeability dispersion can be applied for the left-handed media.Keywords
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