抄録
Acicular manganese zinc ferrite fine particles were made from the as raw materials of acicular α-FeOOH, Mn(C5H7O2)3, and Zn(C5H7O2)2. These fine particles were oriented with the long axis in parallel to the magnetic flux direction by a magnetic field of 7 kOe. The fine particles were then formed into thin, multi-layered toroidal cores. The green bodies were sintered at 1200°C for 6 hours in air, then cooled in a nitrogen atmosphere. The crystals of sintered manganese zinc ferrites were strongly oriented to the direction of the (110) plane of the spinel; this plane was formed along the upper plane of toroidal cores. The crystal growth behavior was similar to that of a manganese zinc ferrite single crystal of the (110) plane. The initial permeability of crystal-oriented manganese zinc ferrites was 2120. The sample exhibited good high-frequency magnetic properties.
