Microstructures and High Frequency Properties of Sm3+ Doped Co(2)Z-Type Hexagonal Ferrites as Anti-EMI Magnetic Bead Materials

作者：Guo Shihai^*; Zhang Yanghuan; Wang Yu; An Jing; Zhao Dongliang

来源：IEEE Transactions on Magnetics, 2014, 50(1): 4002004.

DOI：10.1109/TMAG.2013.2274269

• Anti-EMI magnetic bead
• Co(2)Z-type hexagonal ferrite
• high frequency magnetic properties
• rare earth Samarium ion

The Sm3+ doped Co(2)Z-type hexagonal ferrite materials were prepared by conventional ceramic method and characterized by techniques such as X-ray diffractometer and scanning electron microscopy. The influence of a small amount of Sm3+ addition on structures and magnetic properties of the materials was investigated. The results show that Co(2)Z-type hexaferrite is still in the main phase of the Co(2)Z ferrite materials doped with Sm3+. It is observed that Sm-rich phase with granular morphology is dispersed in the main phase. The hysteresis measurement indicates that the specific saturation magnetization of Sm3+ doped sample is bigger than that of the undoped one. The addition of Sm3+ in Co(2)Z ferrite can decrease the real part mu' and the imaginary part mu" of complex permeability, but increase significantly the cutoff frequency. The Sm3+ doped Co(2)Z ferrites sintered at 1250 degrees C exhibited excellent high frequency properties such as high cutoff frequency above 1.8 GHz and higher initial permeability up to 5.

• 出版日期2014-1
• 单位钢铁研究总院