Investigation of temperature effect on magnetic characteristics of manganese-zinc ferrites
The results of investigating the temperature effect on the characteristics of the soft magnetic crystalline materi- als were presented. Four manganese-zinc ferrites having different compositions of manganese and zinc were exam- ined. The materials studied were shaped as ring cores with a closed magnetic circuit. Each core was wound with the magnetization winding and the measuring winding. Each sample thus created was installed in a cryostat, which was used for stabilizing a predetermined temperature. The magnetic characteristics were measured by a computer- controlled measuring system. The research results indicated a significant relation- ship between the temperature and magnetic properties of manganese-zinc ferrite. Temperature increase led to lower values of all the parameters of the hysteresis loop: the coer- cive field, the induction of the residual magnetization and the maximum induction. At low temperatures below 0 °C, the maximum induction reached its highest values: 450 T in the sample N41, 370 T in the sample F3001, 360 T in the sample F807, 440 T in the sample T38, and at higher tem- peratures, the induction began to decrease. The described phenomenon may find practical use in the manufacture of temperature sensors.