Co含有Z型フェライトの高周波磁気特性に及ぼす希土類イオン置換効果(ソフト磁性材料)

概要

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Ba_3Co_2R_xFe_<24-x>O_<41> (R : rare-earth element, x = 0-0.5) samples with Z-type structure were prepared by the conventional ceramic method. A series of Ba_3Co_2R_xFe_<24-x>O_<41> samples (R = La, Nd, Gd, Dy, Ho, Yb) were made. The frequency dependence of the initial permeability of all samples was measured in frequency range of 0.01-1.8 GHz. The initial permeability (at 0.1 GHz) of Ba_3Co_2R_<0.1>Fe_<23.9>O_<41> (x = 0.1, R = Gd, Dy, Ho, Yb) samples was higher than of the Co_2Z ferrite without substitution. In particular, the initial permeability of Gd^<3+>-substituted Z-type ferrite sample (x = 0.1) was the highest of all samples. The crystal structure of Ba_3Co_2R_xFe_<24-x>O_<41> (x = 0.1) was a single phase of the Z-type structure. As a result, rare-earth ions formed a solid solution of Co_2Z ferrite. The measured lattice constant of these samples (x = 0, 0.1) indicates that La ions substituted for Ba ions and Gd, Dy, Ho, and Yb ions substituted for Fe ions. The apparent specific anisotropy field H_A of a Gd^<3+>-substituted Z-type ferrite sample (x = 0.1) was the lowest of the Ba_3Co_2R_xFe_<24-x>O_<41> samples (x = 0, 0.1). It would therefore appear that the magnetic anisotropy was changed by substitution between Gd ions and Fe ions in Co_2Z ferrites. But verification by other determination is necessary.
社団法人日本磁気学会の論文
2003-04-01