抄録
A further improvement of high-frequency permeability and loss has been required of ferrite materials in accordance with current trends toward downsizing and higher frequency use.
Fe2O3-poor single crystal ferrite that contains CoO was grown by the Bridgeman method for research concerning its high-frequency magnetic characteristics. Single-crystal ferrite with CoO addition showed a significant decrease in high-frequency loss as compared with the conventional crystal ferrite (containing Fe2O3 54 mol %). The permeability was also improved by the addition of CoO at the optimum value.
These results were effected by the two factors.
1. High resistivity of Fe2O3-poor ferrite results in the reduction of eddy current loss.
2. Magnetic anisotropy is changed from negative to positive by the addition of CoO, reducing magnetic anisotropy.
