摘要
采用机械混合法制备不同体积百分含量的锰锌铁氧体磁性颗粒与SiO2非磁绝缘颗粒的颗粒复合体。通过对颗粒复合体比磁化强度、磁导率、磁谱以及77K下I^U特性的测量和分析,我们发现复合体比磁化强度随SiO2含量的增多呈指数衰减;用Musal改进的有效介质理论模型能很好地拟合磁导率随锰锌铁氧体含量变化的规律;颗粒复合体显示出共振型磁谱的特征。最后,研究了复合体电阻随SiO2颗粒含量的变化以及I^U特性。发现随着电压的升高,I^U曲线呈现出非线性特性。
The composites composed of magnetic Mn-Zn ferrite particles and non-magnetic SiO2 particles have been prepared by mechanical mixing. We find that the specific magnetizationσof the composites decreases exponentially with the increase of concentration of SiO2 particles, and the effective permeability μ of the composites can be agreement with the effective media theory (EMT) improved by Musal. Magnetic spectra show a resonant behavior. The resistance of the composites increases not only with the increase of the concentration of SiO2, but also with the decrease of temperature. I^U curves for all samples show a nonlinear characteristic at higher voltage.
出处
《磁性材料及器件》
CAS
CSCD
2003年第5期4-7,共4页
Journal of Magnetic Materials and Devices
基金
江苏省教委科学基金资助课题(Q1108907
T2108103)
关键词
锰锌铁氧体
颗粒复合体
比磁化强度
磁导率
磁谱
I-U特性
Mn-Zn ferrite
particle composite
specific magnetization
permeability
magnetic spectra
I^U characteristic
