Challenge of ultra high frequency limit of permeability for magnetic nanoparticle assembly with organic polymer-Application of superparamagnetism

Daiji Hasegawa, Haitao Yang, Tomoyuki Ogawa, Migaku Takahashi

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Permeability and its upper limitation frequency of superparamagnetic nanoparticle type magneto-dielectric hybrid material were theoretically and experimentally investigated. The Landau-Lifschitz-Gilbert equation without any interaction between nanoparticles revealed that the blocking resonance frequency was able to exceed the ferromagnetic resonance frequency originating from the intrinsic magnetocrystalline anisotropy field by decreasing particle size, resulting in ultra fast switching of superparamagnetic moment in GHz range. In the case of Fe nanoparticles, the blocking resonance frequency can be increased to 130 GHz by reducing particle size to 1 nm. The experiment results for Fe3O4 and Fe nanoparticle assemblies supported the validity of our calculation results. Thus, superparamagnetic nanoparticle assembly could be promising material for high frequency use over 10 GHz range.

Original languageEnglish
Pages (from-to)746-749
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number7
DOIs
Publication statusPublished - 2009 Apr 1

Keywords

  • Blocking resonance
  • High frequency
  • Magnetic nanoparticle
  • Permeability
  • Superparamagnetic

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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