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Enhanced Microwave Absorption Performance of Amorphous Co100-xFex Nanoparticles.

Zhen Wang1, Chao An2, Fenglong Wang1

  • 1Department of Applied Physics, School of Science, Chang'an University, Xi'an 710064, China.

Nanomaterials (Basel, Switzerland)
|July 25, 2025
PubMed
Summary

Researchers developed amorphous cobalt-iron nanoparticles for electromagnetic interference (EMI) shielding. These materials show excellent microwave absorption, overcoming limitations of traditional metallic magnetic materials.

Keywords:
amorphous Co100−xFex nanoparticlescomplex permittivity and permeabilitymicrowave absorption properties

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Metallic magnetic materials are crucial for electromagnetic interference (EMI) mitigation due to high Curie temperatures and permeability.
  • High permittivity in these materials often compromises impedance matching, limiting their effectiveness.
  • Developing materials with balanced electromagnetic properties is essential for advanced EMI shielding.

Purpose of the Study:

  • To synthesize amorphous cobalt-iron (Co100-xFex) alloy nanoparticles with low permittivity.
  • To investigate the influence of atomic ratios on the microwave absorption properties of these nanoparticles.
  • To evaluate the potential of these nanoparticles for effective electromagnetic wave absorption.

Main Methods:

  • A simple aqueous reduction method at room temperature was employed for nanoparticle synthesis.
  • Amorphous Co100-xFex alloy nanoparticles were fabricated with varying atomic ratios.
  • Microwave absorption properties were systematically investigated across the 2-18 GHz frequency range.

Main Results:

  • The synthesized amorphous Co100-xFex nanoparticles demonstrated low permittivity.
  • Excellent electromagnetic wave absorption performance was observed.
  • An effective absorption bandwidth of 5.6 GHz, a matching thickness of 2.60 mm, and a reflection loss of -42 dB were achieved.

Conclusions:

  • Amorphous Co100-xFex nanoparticles offer a promising solution for EMI shielding applications.
  • The developed nanoparticles exhibit superior microwave absorption properties compared to conventional materials.
  • The simple synthesis method and tunable properties make these nanoparticles highly attractive for practical use.