Microwave absorbing materials using Ag-NiZn ferrite core-shell nanopowders as fillers

Cheng Hsiung Peng, Hong Wen Wang*, Shih Wei Kan, Ming Zong Shen, Yu Min Wei, San-Yuan Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

105 Scopus citations


Silver nanoparticles coated with Ni0.5Zn0.5Fe 2O4 spinel ferrites, forming a core-shell structure, were synthesized by utilizing hydrothermal method at different ferrite/silver ratio (ferrite/silver=6/1, 4/1, 2/1, 1/1, 1/6) and introduced into - polyurethane matrix to be a microwave absorber. The complex permittivity (ε′, ε″) and permeability (μ′, μ″) of absorbing composite materials consisted of ferrite/silver core-shell nanopowders and polyurethane were measured in the frequency range of 2-15 GHz. The reflection loss and matching frequency were calculated from measured data using theory of the absorbing wall for different ferrite/silver ratios. It was found that the matching frequency for reflection loss exceeded a satisfactory -25 dB at 9.0 GHz for using NiZn ferrite as a filler shifts to higher frequencies (10.9-13.7 GHz) as the ferrite/silver ratio of core-shell nano-filler decreased from 6/1 to 2/1. The present result demonstrates that microwave absorbers using ferrite/silver core-shell filler can be fabricated for the applications over 9 GHz, with reflection loss more than-25 dB for specific frequencies, by controlling the ferrite/silver ratio of the core-shell nano-fillers in the composites.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Issue number1-3
StatePublished - 1 Dec 2004


  • Core-shell
  • Hydrothermal method
  • Microwave absorption
  • Reflection loss

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