In Situ Embedded FeSiB Nanocrystals in Amorphous Matrix With MOF‐Derived Porous Carbon for Enhanced Electromagnetic Wave Absorption

Because magnetic permeability is an intrinsic property of materials, achieving the regulation of magnetic loss is one of the challenges for electromagnetic wave absorption materials. This paper focuses on the research idea of in situ growth of dispersed nanocrystalline FeSiB in an amorphous FeSiB matrix to regulate magnetic properties. On the other hand, based on impedance matching, composite MOFs‐derived porous carbon is used to optimize dielectric loss characteristics. The dual regulation of magnetism and dielectric properties aims to improve the electromagnetic wave absorption performance of composite materials. The research results show that, when the MIL‐101(Fe) composite is 10 wt% and 20 wt%, the reflection loss (RL) reaches −55.34 and −59.11 dB, corresponding to coating thicknesses ( d ) of 1.54 and 1.45 mm and frequencies ( f ) of 17.24 and 16.05 GHz, respectively. The effective absorption bandwidths (EAB, RL ≤ −10 dB) are 6.78 and 3.58 GHz at d  = 2.4 and 2.0 mm, respectively. This study provides a useful reference idea for constructing FeSiB soft magnetic composite electromagnetic wave absorption materials.