Magnetic Hysteresis and Demagnetizing-Field Correction for Rare Earth Magnet Materials
Magnetic Hysteresis and Demagnetizing-Field Correction for Rare Earth Magnet Materials
复制标题
稀土磁体材料的磁滞和退磁场校正
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
H. Kato
中科院分区：
文献类型：
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作者：
Y. Nakagawa;H. Kato
使用闭合磁路测量磁化强度的标准方法不能应用于具有非常高的矫直力的稀土磁体材料。因此，在本文中，我们研究了在稳定的强磁场中的开路磁路方法，其中退磁场的校正是重要的。用不同尺寸比的圆柱形样品测量了几种商用稀土磁体材料的磁滞回线。对于粘结磁体，退磁场的修正给出了一个合理的结果，而在烧结磁体的情况下，甚至本征矫顽力似乎也取决于样品的形状。因此，有必要重新考虑退磁磁场的修正以及稀土磁体材料的标准规范。
The standard method for measuring magnetization, using a closed magnetic circuit, cannot be applied to rare earth magnet materials with very high coercivity. Hence in this paper we examine an open magnetic circuit method in a steady high magnetic field, in which correction for the demagnetizing field is important. We measured hysteresis curves for some commercial rare earth magnet materials by using cylindrical samples with various dimension ratios. The correction for the demagnetizing field gives a reasonable result for bonded magnets, whereas even the intrinsic coercivity seems to depend on the sample shape in the case of sintered magnets. Therefore, it is necessary to reconsider the correction for the demagnetizing field as well as the standard specifications of rare earth magnet materials.