Enhancement of the microwave absorption properties of the SrFe12O19@Fe3O4@rGO composite material

In this work, graphene oxide (GO) was prepared via the Hummers’ method, whereas SrFe₁₂O₁₉, SrFe₁₂O₁₉@Fe₃O₄, and SrFe₁₂O₁₉@Fe₃O₄@rGO were fabricated using the hydrothermal techniques. The samples' phase structure, surface morphology, magnetic properties, and electromagnetic wave absorption characteristics were studied and compared. Findings show that the Fe₃O₄ particles adhered to the surface of the SrFe₁₂O₁₉ hexagonal plates, and the combination of SrFe₁₂O₁₉@Fe₃O₄ foam flakes and two-dimensional graphene rGO could enhance the absorption electromagnetic wave performance. The composite SrFe₁₂O₁₉@Fe₃O₄@rGO sample exhibited an ideal impedance matching within the frequency f range of 11 GHz–12.4 GHz. The minimum reflection loss reached −62.3 dB at 12.2 GHz with a thickness of 2 mm. With a thickness of 2 mm, the effective absorption bandwidth obtained the value of −20 dB, covering a range of 9.3 GHz. The composite SrFe₁₂O₁₉@Fe₃O₄@rGO sample, which shows the highest performance both in reflectivity and bandwidth, can find potential application in microwave absorptions.