Theory of the approach to magnetic saturation
Theory of the approach to magnetic saturation
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DOI：
10.1103/physrev.58.736
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发表时间：
1940-10-01
期刊：
影响因子：
--
通讯作者：
Brown, WF
中科院分区：
文献类型：
--
作者：
Brown, WF
在高场下磁化的标准理论处理得到了公式J=J，-b/H2；在实验上，也找到了项-a/H。在标准处理中，假设导致饱和不完全的内力在包含非常多原子的距离上近似均匀。如果这些力在较短的距离内迅速变化，原子间的耦合力将阻止微观磁化方向以相同的速度变化，I/HM定律不再遵循。文中指出，对于H)和4m J“，力的点、线和面集中导致定律。J=J，-a/II“/‘，其中n分别为I，2和3.对于II和/47’J，这一规律是相同的，但J和a的表观数值不同.对于H-47rJ，其行为更为复杂.由于塑性流动的机制被认为是位错线通过晶格的传播，所以所观察到的a/H项是由线集中的力所引起的结论得到了塑性应变程度的依赖的支持.
The standard theoretical treatment of magnetization at high fields leads to a formula J= J,—b/H2; experimentally, a term—a/H is also found. In the standard treatment it is assumed that the internal forces responsible for the incompleteness of saturation are approximately uniform over distances containing a very large number of atoms. If these forces vary rapidly over shorter distances, the interatomic coupling forces prevent the direction of microscopic magnetization from varying with equal rapidity, and the i/Hm law nolonger follows. It is shown here that for H) &4m J „point, line, and plane concentrations of force lead to laws. of the form J= J,—a/II"/', with n= i, 2, and 3, respectively. For II&/47'J. the law is of the same form, but with different apparent values of J, and a. For H—47rJ. the behavior ismore complicated. The conclusion that the observed a/H term isdue to line concentrations of force is supported by the dependence of a on degree of plastic strain, since the mechanism of plastic flow is believed to be a propagation of dislocation lines through thelattice.