Permeability and electromagnetic-interference characteristics of Fe–Si–Al alloy flakes–polymer composite

Shigeyoshi Yoshida, Mitsuharu Sato, Eishu Sugawara, Yutaka Shimada

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243 Citations (Scopus)


A magnetic sheet made of Fe–Si–Al flakes was found to have excellent permeability and electromagnetic-interferences characteristics in a quasimicrowave band. The flakes prepared by attrition were embedded in a polymer with their planes lying parallel to the sheet plane. This sheet exhibits a peculiar dual dispersion in permeability. The Curie temperature of the flakes increases with increasing specific surface area of the flakes. This suggests the composition of the flakes changes to excess Fe by oxidation of Si and Al. This deviation from the Sendust composition brings an increase of a magnetoelastic effect and the dual frequency dispersion seems to be associated with stress caused by attrition. On the basis of these results, flakes with more desirable permeability characteristics were produced from raw powder with less Fe content. Consequently, we could fabricate a magnetic composite that possesses superior noise suppressing effect in a quasi-microwave band.

Original languageEnglish
Pages (from-to)4636-4638
Number of pages3
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 1999 Apr 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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