# 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.

## Key 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.