A novel and facile route for the in situ formation of composites with dual coupling interactions for considerable millimeter wave absorption performance

Abstract

It is well known that both hard/soft magnetic exchange-coupling and ferroelectric-ferromagnetic coupling could facilitate the microwave absorption behavior. Herein, we propose the BaZrxFe12-xO19/Fe3O4/BaZrO3 composites to integrate the advantages of the...

Remarkable Magnetic Exchange Coupling via Constructing Bi‐Magnetic Interface for Broadband Lower‐Frequency Microwave Absorption

“…Interface engineering strategy has played a positive role in the permeability value via the magnetic coupling effect. Particularly, the construction of hard/soft magnetic hetero interface towards the complimentary magnetic property has attracted the most attention owing to the flexible tailoring of exchange coupling interaction, for example, MWCNTs/ [20][21][22][23][24][25] However, current hard/soft magnetic composites generally accomplish the simple combi nation of magnetic components but lack the finetailoring of exchange coupling intensity, which results in the insufficient coupling and limited MA performance, as it's arduously chal lenging to increase the utilization rate of contact interface due to the absence of robust microstructure. Thereby, to harness the potential advantages of magnetic interfacial effect and sup port MA application, structural optimization for the unit in the magnetic material is significantly indispensable.…”

High Dielectric Fe3O4 and Fe2O3 Nanoparticles Deposited on Graphite Nanosheets for Electromagnetic Wave Absorption

“…In Figure d–f, the frequency dependences of μ′, μ″, and tan δμ for S-150, S-250, S350, and S-450. It has been reported that the natural resonant frequency of soft magnetic Fe 3 O 4 usually occurs at less than 2 GHz. , Magnetic losses in composites are usually related to the natural resonance and eddy currents of ferromagnetic absorbers . The fluctuation of the μ′ and μ″ curves in the whole frequency range means that there are natural resonance, eddy current loss, and exchange resonance, which can enhance the magnetic loss of the composites.…”

“…31,32 Magnetic losses in composites are usually related to the natural resonance and eddy currents of ferromagnetic absorbers. 33 The fluctuation of the μ′ and μ″ curves in the whole frequency range means that there are natural resonance, eddy current loss, and exchange resonance, 34 which can enhance the magnetic loss of the composites. The tan δμ curve exhibits a trend similar to that of μ″.…”