Dielectric and magnetic properties of NiCuZn ferrite coated Sendust flakes through a sol-gel approach

Z. H. Yang, Z. W. Li, Y. H. Yang, L. Liu, L. B. Kong

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Sendust flakes (with 9.59% Si, 5.88% Al and balanced Fe) were coated with NiCuZn ferrite nanoparticles by using a simple sol-gel approach. Both the coated and uncoated flakes were characterized by using scanning electron microscopy, X-ray diffraction and vibrating sample magnetometer. Composites made from the Sendust flakes with the in-plane alignment were fabricated via a vacuum infiltration method. Microwave measurement results indicated that permittivity of the composite made of the coated Sendust flakes was remarkably reduced, with a slight decrease in permeability over 0.1-8.55 GHz. Consequently, the sample with a thickness of 6 mm showed reflection loss exceeding -20 dB at 1.4 GHz, while reflection loss of the composite derived from the uncoated Sendust flakes could not reach -10 dB at the same sample thickness. Therefore, the Sendust flakes coated with NiCuZn ferrite nanoparticles could be promising candidates to develop microwave attenuation materials.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume331
DOIs
StatePublished - Apr 2013
Externally publishedYes

Keywords

  • Complex permeability
  • Complex permittivity
  • Microwave attenuation
  • Sendust flake
  • Sol-gel approach
  • Vacuum infiltration method

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