偏平状Fe-Si-Al合金粉末・ポリマー複合体の透磁率と高周波ノイズ抑制効果

概要

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A magnetic sheet made of Fe-Si-Al flakes was found to have excellent permeability and EMI characteristics in quasi-microwave band. Flakes prepared by mechanical smashing were embedded in polymer with their planes lying parallel to the sheet plane. The sheet exhibits a peculiar dual dispersion in permeability. The Curie temperature of the flakes increases as the specific surface area of the flakes increases. This suggests that the composition at the surface of the flakes comes to contain excess Fe as result of oxidation of Si and Al. This deviation from the Sendust compostion brings about an increased magneto-elastic effect near the surface, 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. This made it possible to fabricate a complex magnetic material that possesses a superior noise suppressing effect in quasi-microwave band.
社団法人日本磁気学会の論文
1998-11-01