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

研究成果: Article査読

43 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)746-749
ページ数4
ジャーナルJournal of Magnetism and Magnetic Materials
321
7
DOI
出版ステータスPublished - 2009 4 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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