Magnetic Alignment of Permanent Magnet Powder
Magnetic Alignment of Permanent Magnet Powder
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永磁粉磁力排列
DOI：
10.2497/jjspm.49.717
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Takaki
中科院分区：
文献类型：
--
作者：
K. Makita;S. Takaki
研究了Nd-Fe-B和Sr铁氧体磁粉在外加磁场作用下的取向。未固定粉末的初始磁化曲线显示，在名为Hrot的场处磁化强度突然增加，这可能与易磁化轴开始向外加场旋转有关。Dy取代Nd后，Nd-Fe-B粉末的矫顽力发生了变化，但Hrot值保持稳定。当封装在样品保持器中的粉末的体积比例增加时，旋转被抑制，磁化强度降低。Nd-Fe-B粉末形成了许多稳定的柱状体，它们与外加磁场平行。柱的直径大约几百微米。在圆柱内部，磁铁粉末形成平行于所施加的磁场排列的小链。基于小型磁体模拟粉末颗粒的模型实验，将对准过程分为技术磁化、旋转/运动和对准3个步骤。
The alignment of magnet powder such as Nd-Fe-B and Sr-ferrite under applied magnetic field was investigated. Initial magnetization curves of the unfixed powder showed sudden increase of magnetization at a field named Hrot which can be related to the beginning of rotation of the easy axis towards the applied field. Although the coercive force of Nd-Fe-B powder had changed by the substitution of Nd by Dy, the value of Hrot remained stable. When the volume proportion of powder capsulated in a sample holder had increased, the rotation was suppressed and the magnetization decreased. Nd-Fe-B powder formed many stable columns which are parallel to the applied field. The diameter of the columns are about few hundred microns. Inside the columns, magnet powder formed small chains aligned parallel to the applied field. Based on the model experiment where the powder particles are simulated by small magnets, the process of alignment was classified to three steps: technical magnetization; rotation/movement; alignment.