Microwave absorption properties of polymer modified Ni-Zn ferrite nanoparticles

Kazuaki Shimba, Kiyotaka Furuta, Nobuyuki Morimoto, Nobuki Tezuka, Satoshi Sugimoto

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Polymer composites of magnetic particles are widely used as microwave absorbers. An effective method for obtaining thinner microwave absorbers for device design is increasing the volume fraction of magnetic nanoparticles by enhancing the permeability of composites. In this study, composites were prepared using Ni-Zn ferrite nanoparticles surface-modified with 4-META (4-methacryloylioxyethyl trimellitate anhydride) and cross-linked with PEG-4SH (pentaerythritol tetra-polyethylene glycol ether with four thiol-modified terminals). These composites have a high volume fraction of nanoparticles (up to 72 vol%) and permeability (μrmax= 5.9). In addition, the prepared composites showed good microwave absorption properties (R.L. < -20 dB) with a smaller matching thickness than conventional microwave absorber using spinel-type ferrite.

Original languageEnglish
Pages (from-to)740-745
Number of pages6
JournalMaterials Transactions
Volume52
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1

Keywords

  • Cross-linking
  • Magnetic nanoparticles
  • Microwave absorbers
  • Nickel-zinc ferrite
  • Surface modification

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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