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)