硬磁钐钴和软磁钴银合金复合材料的磁滞和电阻抗谱(英文)

Magnetic Hysteresis and Electrical Impedance Spectra of Hard Magnetic SmCo_5 and Soft Magnetic Co_(30) Ag_(70) Composites

在磁场下,采用振动样品磁强计和电阻抗测试仪来研究加入 0%,5% 和 10%(质量分数)的硬磁钐钴的钴银合金在矫顽场不变的情况下,颗粒状复合材料的剩余磁化强度伴随钐钴质量分数的增加而增加。在 10 kHz^100 kHz 区间,各复合材料的电阻抗均未表现大的变化。但是,在 200 kHz^1 MHz 区间,由于趋肤效应,电阻抗迅速增加。当磁场为 3.3 kA/m,所有的阻抗谱都发生了微移。其中,未加钐钴的钴银合金阻抗谱发生了最大的偏移。这些结果确定了在磁场下材料软磁特性与其电阻抗的关系。

A Vibrating Sample Magnetometer （VSM） and a set-up for electrical impedance measurement in magnetic field were employed to study Co30Ag70 mechanical alloys with additions of 0%, 5% and 10% （mass fraction） hard magnetic SmCo5. With increasing SmCo5 content, the particulate composites exhibited an increase in the remanent magnetization when the coercive field remained rather constant. The electrical impedance of each composite did not show a large variation between 10 kHz and 100 kHz but rapidly rose with the increase in frequency from around 200 kHz to 1 MHz due to the skin effect. All impedance spectra were slightly shifted when the magnetic field of 3.3 kA/m was applied. The largest difference was observed in the case of Co30Ag70 without SmCo5 addition. The results confirmed the relationship between the magnetic softness of materials and their electrical impedance in magnetic field.