Electromagnetic Properties of Fe-Cr-Si-Al Magnetic Flake/Co_2Z Ferrite Powder Composites

The gas atomized Fe-Cr-Si-Al(SMSS)alloy powder was flattened by mechanical milling, and Ba_3Co_2Fe_(24)O_(41)(Co_2Z)hexagonal ferrite powder was synthesized by a citrate sol-gel process,re- spectively.The products were characterized by SEM and XRD.Furthermore,the complex permittivity and complex permeability of SMSS /Co_2Z composites with various mass ratios were measured within 2.0-8.2 GHz.The results show that the complex permittivity and complex permeability substantially decrease with the increase of Co_2Z powder fraction in the composites.Meanwhile,the calculated re- flection loss(RL)curve indicates that the matching frequency shifts to high value,and when the mass ratio of SMSS/Co_2Z is 4/1,the sample possesses a minimum RL value.