Decreasing the complex permittivity to enhance microwave absorption properties of flaky FeSiAl/MnZn ferrites composites

Suppressed conductive loss of flower-like NiCo2O4-wrapped flaky FeSiAl for excellent low-frequency microwave absorption

“…The and increased the H C value, which affect the natural resonance frequency (f r ) and the complex permeability (µ r ) [17]. This phenomenon was mainly attributed to the introduction of ferromagnetic NiCo 2 O 4 , which is consistent with the results obtained for MnZn ferrite@flaky FeSiAl composites [16] and Fe 3 O 4 -modified flaky FeSiAl [17].…”

“…Noticeably, the electromagnetic radiation frequency bands in 4G and 5G communication is frequently concentrated in the low-frequency microwave range (2-8 GHz) [3]. Considering the effective absorption of high frequencies (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)) by various designed MAMs, mainly including carbon-based materials [4] and ferrites [5], high-performance MAMs that can be used for low-frequency microwave must be developed urgently.…”

“…Decreased complex permittivity and improved microwave absorption properties were achieved using these oxides. However, the existence of nonmagnetic oxide caused a steady decrease in the µ r value, and the effective absorption bandwidth (EAB) only covered the X and Ku bands (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). Extensive studies have focused on the exploitation of alternative high resistance and magnetic layers.…”

“…Extensive studies have focused on the exploitation of alternative high resistance and magnetic layers. Recently, Yan et al reported the microwave absorption properties of MnZn ferrite@flaky FeSiAl composites [16]. A minimum refection loss (RL min ) of −26.8 dB was achieved at 4.4 GHz and a thickness of 3.0 mm.…”

Tailored microwave absorption performance through interface evolution by in-situ reduced Fe nanoparticles on the surface of FeSiAl microflake

“…SiO 2 /polyurethane-acrylic (PUA) double layer covered FeSiAl with 20 wt% paraffin wax shows RL m of −49 dB at 5.8 GHz and EAB of 7.8 GHz at 2.5 mm [18]. Zhou et al applied the sol-gel combustion method to form MnZn ferrites layer covered on FeSiAl flake, dramatically decreasing ε r from 23 to 16 and the composites possess RL m of −35.3 dB at 8.5 GHz and EAB of 2.7 GHz [19].…”