Abstract
Sr3Co2Fe24O41 hexaferrite powders were prepared via sol-gel synthesis and calcination. The hexaferrite powders after calcination in the temperature range of 1225–1245 °C had almost a single Z-type phase. The Z-type hexaferrite-epoxy (10 wt%) composite sample exhibits ferromagnetic resonance (FMR) at 2.9 GHz and strong electromagnetic (EM) wave absorbing performance with the lowest reflection loss (RLmin) < −50 dB around the FMR frequency. The FMR frequency gradually shifted to 3.9 and 6.5 GHz when external magnetic fields (H) of 250 and 450 Oe were applied, respectively. It is demonstrated that EM wave absorption in the hexaferrite-epoxy composites arises from ferromagnetic resonances (FMR) in the gigahertz band. The frequency of RLmin changes in accordance with the shift in the FMR frequency induced by an external magnetic field. The Z-type hexaferrite–epoxy composite is a highly promising material for EM wave absorption in the gigahertz band (2–10 GHz).
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