现有的一些弱磁材料标准测磁方法,忽视了退磁场对冲击法磁化强度测量的重要影响,因而给出了过于乐观的精度估计。本文分析了退磁场对弱磁测量的影响,计算了无磁圆柱样品关于样品和线圈的冲击退磁因子,给出了退磁场引起的磁场、磁化强度测量误差及其修正办法,对弱磁测置的标准尺寸提出了建议。
An over-optimistic assessment in accuracy is often resulted from the magnetization measurement by the current standard methods for the feebly magnetic materials due to ignoring the significant influence of demagnetizing field on the ballistic method. Analysis is reported on the effect of demagnetizing field upon the feebly magnetic measurement, and calculation is presented to two kinds of ballistic demagnetizing factors which are about non-magnetic cylindrical specimen itself and about its measuring coil. Thus, the errors of H and M measurements in regard tO the demagnetizing field and their correct method as well are given. It may be suggested that a set of standard dimensions for the feebly magnetic measurement is available.
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