Spinel ferrite flakes Ni0.97xZnxCo0.03Fe2O4 with x=0.5 and 0.65 are prepared for use as fillers in electromagnetic composites. The composites with the flaky fillers exhibit greatly enhanced high-frequency and attenuation properties. The complex permeability, μ0 and μmax, is enhanced by about 500%–700%, and the relative attenuation bandwidth WR is increased by 300%–440%, as compared to those for composites with conventional spherical fillers. WR achieves 90% of the theoretically maximum relative bandwidth. The composites with the spinel ferrite flaky fillers are powerful and potential candidates as electromagnetic attenuation materials with ultrabroad bandwidth at microwave L, S, and C bands.

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