軟磁性フェロックスプラナ型フェライトの高周波磁気特性

概要

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Y-type (Ba2Zn2Fe12O22; Y), M-type (BaCo1.1Ti1.1Fe9.8O19; MCT) and mixture of these hexagonal ferrites (Y+xMCT; x=0∼3) were prepared by the conventional solid-state reaction approach. Samples were made with BaCO3, ZnO, CoO, TiO2 and α-Fe2O3 as starting materials. The frequency dependence of the initial permeability of all samples was measured using an impedance analyzer (HP4291B). The initial permeability of Ba3Zn2Co1.1Ti1.1Fe21.8O41 (x=1) was 23 (at 100MHz), which is the highest value in this study and the Snoeks product of this sample has been reached to 14.7GHz. This value is twice larger than that of Zn2Y. The detailed analysis of frequency dependent permeability curves for these samples strongly suggests that this enhancement of the Snoeks product is due to the change of magnetic anisotropy caused by the substitution of Co2+ and Ti4+ ions for Fe3+ ions.
社団法人粉体粉末冶金協会の論文
2006-03-15