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Electromagnetic Wave Absorption Characteristics of Nanocrystalline FeCuNbSiB Alloy Flakes/Polymer Composite Sheets with Different Flake Thickness

Journal of Magnetics, Volume 14, Number 4, 31 Dec 2009, Pages 155-160

Tae-Gyu Lee (School of Materials Science & Engineering, The Center for Green Materials Technology), Ju-Beom Kim (School of Materials Science & Engineering, The Center for Green Materials Technology), Tae-Hwan Noh *

(School of Materials Science & Engineering, The Center for Green Materials Technology)

Abstract

This study examined the effects of a decrease in thickness of magnetic alloy flakes on the electromagnetic wave absorption characteristics of nanocrystalline Fe_73.5Cu₁Nb₃Si_15.5B₇ (at.%) alloy flakes/polymer composite sheets available for a quasi-microwave band. The thickness of FeCuNbSiB alloy flakes decreased to 1-2 μm with increasing milling time up to 24 h, and the composite sheet including alloy flakes milled for 24 h exhibited considerably enhanced power loss properties in the GHz range compared to the sheets having non-milled alloy powders. Although a considerable increase in loss factor upon milling was observed in the narrow frequency range of 4-6 GHz, there was no correlation between the complex permeability and flake thickness. However, the complex permittivity increased with increasing milling time, and there was good agreement between the milling time and the frequency dependences of the complex permittivity and power loss.

Keywords: electromagnetic wave absorption; nanocrystalline FeCuNbSiB alloy; composite sheets; flake thickness

DOI: 10.4283/JMAG.2009.14.4.155

Full Text: PDF

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