Microwave Absorption Properties of FeSiCr/MnZn Ferrite Composites Prepared by Two-Step Synthesis

FeSiCr/MnZn ferrite composites with low permittivity were prepared by a two-step synthesis method, which can improve the absorbing property of the material. The phase and thermal behavior of the composites were analyzed by x-ray diffractometry, thermogravimetric analysis/differential scanning calorimetry. The morphology was studied by scanning electron microscopy. The soft magnetic properties and electromagnetic parameters of the material were tested by a vibrating sample magnetometer and a vector network analyzer. The results show that, compared with pure FeSiCr powders, the complex permittivity of a FeSiCr/MnZn ferrite composite was significantly decreased, while the complex permeability was slightly decreased, achieving a more ideal impedance matching. When the MnZn ferrite content is 15% and the simulated thickness is 2 mm, the minimum reflection loss (RL) of the sample reached - 27.4 dB at 10.4 GHz, and the bandwidth reached 5.0 GHz when RL exceeded - 10 dB. (GRAPHICS)

Automated summary

FeSiCr/MnZn ferrite composites with low permittivity were prepared by a two-step synthesis method, which improved the absorbing property of the material. The phase and thermal behavior of the composites were analyzed, and the morphology was studied. The soft magnetic properties and electromagnetic parameters were tested. The results showed a significant decrease in complex permittivity and a slight decrease in complex permeability, achieving a more ideal impedance matching. The sample exhibited a minimum reflection loss of -27.4 dB at 10.4 GHz and a bandwidth of 5.0 GHz when RL exceeded -10 dB, with a MnZn ferrite content of 15% and a simulated thickness of 2 mm.