NiCuZnフェライトの透磁率の温度特性に及ぼすAl_2O_3添加の影響

概要

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The effects of Al2O3 addition on the temperature dependency of initial permeability and microstructure of NiCuZn ferrites were investigated. The temperature dependency of initial permeability decreases as Al2O3 addition increases. EPMA analysis revealed that Al2O3 dissolves into the grains of NiCuZn ferrite, but the dispersion is not uniform. By separating the initial permeability into the contributions of spin rotation and domain wall motion, it was found that the temperature dependence of the domain wall motion derived part of permeability decreases as Al2O3 addition increases, while that of the part derived from spin rotation changes little. This indicates that the decrease of the temperature dependency of initial permeability may be attributed to the influence of Al2O3 on the domain wall motion.
社団法人粉体粉末冶金協会の論文
2009-09-15