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Multi-layered nano-hollow spheres for efficient electromagnetic wave absorption.

Anupam Gorai1, Dipika Mandal1, Kalyan Mandal1

  • 1Department of Condensed Matter Physics and Materials Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Saltlake, Kolkata-700106, India.

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|June 4, 2021
PubMed
Summary

Ferrite nano-hollow spheres (NHS) coated with dielectric SiO2 and ferrimagnetic CoFe2O4 offer enhanced electromagnetic wave absorption. The MnFe2O4@CoFe2O4 NHS achieved -47.0 dB reflection loss, demonstrating superior performance for practical applications.

Keywords:
impedance matchingmicrowave absorbernano-hollow spheresreflection loss

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Ferrite nano-hollow spheres (NHS) are crucial for improving electromagnetic (EM) wave absorption.
  • Enhancing EM wave attenuation requires effective strategies for material design.

Purpose of the Study:

  • To investigate the EM wave absorption properties of bare and bi-layered ferrite NHS.
  • To explore the potential of MnFe2O4@CoFe2O4 and MnFe2O4@SiO2 NHS as efficient EM wave absorbers.

Main Methods:

  • Synthesis of bare MnFe2O4 NHS and bi-layered MnFe2O4@CoFe2O4 and MnFe2O4@SiO2 NHS.
  • Characterization of EM wave absorption properties in the 1-17 GHz frequency range.
  • Analysis of impedance matching and attenuation constant.

Main Results:

  • MnFe2O4@CoFe2O4 NHS exhibited excellent reflection loss (RL) of -47.0 dB at 20 wt% filler content with a broad bandwidth (BW) of ~2.2 GHz.
  • The attenuation constant increased significantly for MnFe2O4@CoFe2O4 NHS (457.8 Np m⁻¹).
  • MnFe2O4@SiO2 NHS achieved high RL of ~-30.0 dB with a 3 mm thick absorber, showing good agreement with the λ/4 model.

Conclusions:

  • Optimized MnFe2O4@CoFe2O4 NHS demonstrate superior EM wave absorption capabilities due to enhanced interfacial area, dipole pairs, magnetic anisotropy, and internal scattering.
  • The study highlights the potential of these low-cost, lightweight ferrite NHS for practical high-frequency EM wave absorption applications.