金属元素置換M型バリウムフェライトの高周波磁気特性(ソフト磁性材料)

概要

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Co-Zn-Ti substituted M-type barium ferrites of BaCo_xTi_xFe_<12-2x>O_<19> (x=1-3) and BaCo_<1.1>Zn_yTi_<1.1+y>Fe_<9.8-2y>O_<19> (y=0-1.0) were prepared by a powder metallurgy method. Their characteristics were examined by using an X-ray diffractometer, a vibration sample magnetometer (VSM), a vector impedance analyzer, and a scanning electron microscope. When Fe ions of BaFe_<12>O_<19> were replaced with Co-Ti ions, the magnetic anisotropy and coercivity decreased. As a result, the initial permeability increased to 27 for a sample with x=1.15. Zn-Ti ions were also substituted for Fe ions in BaCo_<1.1>Ti_<1.1>Fe_<9.8>O_<19>. When the amount of substitution (y) was 0.4 in BaCo_<1.1>Zn_yTi_<1.1+y>Fe_<9.8-2y>O_<19> (y=0-1.0), the initial permeability at 10 MHz had a very high value of about 40. The reason for this may be that the coercivity becomes small as a result of the growth of the crystal particles and the decrease in the anisotropic magnetic field.
社団法人日本磁気学会の論文
2006-05-01