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本文根据实验数据,证实热磁仪的读数与试样磁化强度4πJ之间远非线性关系;目前沿用的计算公式有根本性的缺点。因此在考虑了磁化强度向量对试样轴线的偏离后重新讨论了热磁仪的计算公式;测定了圆柱体试样的横向退磁因子N_n与纵向退磁因子N_p之差N=N_n-N_p。用修正后的公式和测得的N值计算出的曲线与实验值吻合良好。
In this paper, based on the experimental data, it is proved that the readings of the thermal magnetometer are far from linear with the magnetization of the sample 4πJ. The formulas used at present have the fundamental shortcomings. Therefore, after taking into account the deviation of the magnetization vector from the axis of the sample, the thermal magnetocaloric formula was revisited. The difference between the transverse demagnetizing factor N_n and the longitudinal demagnetizing factor N_p was measured. The curve calculated from the corrected formula and the measured N value is in good agreement with the experimental data.