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http://dx.doi.org/10.4150/KPMI.2008.15.4.292

Electromagnetic Wave Absorption Behavior of a Fe-based Nanocrystalline Alloy mixed with a Ferrite Powder  

Koo, S.K. (School of Nano Engineering, Inje University)
Lee, M.H. (School of Nano Engineering, Inje University)
Moon, B.G. (Advanced Materials Research Division, Korea Institute of Materials Science)
Song, Y.S. (Research Institute, Amosense Co.)
Sohn, K.Y. (School of Nano Engineering, Inje University)
Park, W.W. (School of Nano Engineering, Inje University)
Publication Information
Journal of Powder Materials / v.15, no.4, 2008 , pp. 292-296 More about this Journal
Abstract
The electromagnetic (EM) wave absorption properties of the $Fe_{73}Si_{16}B_7Nb_3Cu_1$ nanocrystalline powder mixed with 5 to 20 vol% of Ni-Zn ferrites has been investigated in a frequency range from 100MHz to 10GHz. Amorphous ribbons prepared by a planar flow casting process were pulverized and milled after annealing at 425 for 1 hour. The powder was mixed with a ferrite powder at various volume ratios to tape-cast into a 1.0mm thick sheet. Results showed that the EM wave absorption sheet with Ni-Zn ferrite powder reduced complex permittivity due to low dielectric constant of ferrite compared with nanocrystalline powder, while that with 5 vol% of ferrite showed relatively higher imaginary part of permeability. The sheet mixed with 5 vol% ferrite powder showed the best electromagnetic wave absorption properties at high frequency ranges, which resulted from the increased imaginary part of permeability due to reduced eddy current.
Keywords
Electromagnetic wave absorption; Ni-Zn ferrite; Nanocrystalline powder;
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Times Cited By KSCI : 2  (Citation Analysis)
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