Enhanced Microwave Absorption Performance of Amorphous Co100−xFex Nanoparticles

TL;DR

Researchers developed amorphous cobalt-iron nanoparticles with improved microwave absorption properties for better electromagnetic interference mitigation.

Contribution

The study introduces amorphous Co100−xFex nanoparticles with low permittivity and enhanced microwave absorption performance.

Findings

Amorphous Co100−xFex nanoparticles achieved an effective absorption bandwidth of 5.6 GHz.

They exhibited a reflection loss of −42 dB at a matching thickness of 2.60 mm.

The nanoparticles were synthesized using a simple aqueous reduction method at room temperature.

Abstract

Metallic magnetic materials are extensively used to mitigate electromagnetic interference due to their high Curie temperatures and permeability. However, their high permittivity often hinders impedance-matching effectiveness, limiting their utility. In this study, amorphous cobalt–iron (Co100−xFex) alloy nanoparticles with relatively low permittivity were synthesized using a simple aqueous reduction method at room temperature. The effect of atomic ratio variation on the microwave absorption properties of these nanoparticles was investigated across 2–18 GHz. The amorphous Co100−xFex nanoparticles exhibited excellent electromagnetic wave absorption performance, achieving an effective absorption bandwidth of 5.6 GHz, a matching thickness of 2.60 mm, and a reflection loss of −42 dB.

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