抗磁质

by Ailiss 9/26/2008 12:51:00 PM
抗磁质是磁介质中的一类，其相对磁导率是常数，略小于1，对外磁场的影响较小，属于弱磁性材料。
　　无外磁场时，抗磁质的分子固有磁矩m=0，对外不显磁性；
　　有外磁场时，抗磁质分子受磁场作用生成感应磁矩m'，且磁矩方向和外磁场方向相反。于是就在磁介质内部产生与外磁场方向相反的附加磁场，从而使总磁场减弱。这就是所谓的抗磁效应。

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