Superspin glass originating from dipolar interaction with controlled interparticle distance among γ-Fe2O3 nanoparticles with silica shells

Kosuke Hiroi, Katsuyoshi Komatsu, Tetsuya Sato

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

γ-Fe2O3/SiO2 core-shell nanoparticles with different shell thicknesses were prepared to elucidate the condition for superspin-glass (SSG) dynamics. As the shell thickness decreases, the contribution of interparticle dipolar interaction becomes apparent in the magnetic dynamics of nanoparticle assembly. The frequency dependence of peaks in ac-magnetic susceptibility in samples with strong interactions slows down, which is characterized as the emergence of a spin-glasslike phase. Aging in magnetization relaxation is found in a strongly interacting sample with an interparticle distance of L≤14 nm but is scarce in a sample with L = 18 nm. Scaling analysis reveals an increase in superparamagnetic properties with an increase in L. Therefore the critical interparticle distance necessary for SSG transition is 15-18 nm with 11-nm γ-Fe2O3 nanoparticles. This corresponds to the ratio of interparticle-interaction energy to the magnetic-anisotropy energy Edip/Ea of 6-12%.

Original languageEnglish
Article number224423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number22
DOIs
Publication statusPublished - 2011 Jun 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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