Abstract
The effects of the both grain size of a sintered body and the oxidation state of Fe ions on hysteresis loss of MnMgZn ferrite were studied in order to achieve low core loss. It is shown that grain growth is effective for achieving low hysteresis loss, but that the hysteresis loss falls to a minimum at an average grain size of 4μm. High temperature firing leads not only to grain growth but also to a reduction in number Fe3+ ions. It is thought that an appropriate number of Fe2+ ions lowers the magnetic anisotropy and results in low hysteresis loss. Mn2O3 addition and low oxygen partial pressure during the cooling state are effective for reducing core loss.
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