Abstract: The gas atomized Fe-Cr-Si-Al (SMSS) alloy powder was flattened by mechanical milling, and Ba₃Co₂Fe₂₄O₄₁(Co₂Z) hexagonal ferrite powder was synthesized by a citrate sol-gel process, respectively. The products were characterized by SEM and XRD. Furthermore, the complex permittivity and complex permeability of SMSS /Co₂Z 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 Co₂Z powder fraction in the composites. Meanwhile, the calculated reflection loss (RL) curve indicates that the matching frequency shifts to high value, and when the mass ratio of SMSS/Co₂Z is 4/1, the sample possesses a minimum RL value.

Key words: Fe-Cr-Si-Al, Co₂Z, complex permittivity, complex permeability