Magnetic properties of Co/(CoNi)Fe2O4 nanocomposite magnet powders

Satoshi Sugimoto, Kazuaki Haga, Toshio Kagotani, Koichiro Inomata

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Co/(CoNi)Fe2O4 nanocomposite powders were prepared by mixing coprecipitated (CoO)0.9(NiO)0.1·Fe 2O3 nanoparticles with Co nanoparticles, which were synthesized by alcohol reduction. TEM observations reveal that the powder consists of Co and (CoO)0.9(NiO)0.1·Fe 2O3 nanoparticles with an average particle size of 30-50 nm. While the coercivity (HcJ) is 156 kA/m, the saturation magnetization (σs) of 115.8 Am2/kg is obtained, which is comparable to that of Co nanoparticles. In the hysteresis loop, magnetization changes smoothly with field as the hysteresis behavior of a single-phase material. The high recoil ratio (Rrecoil) of 0.69 and the positive ΔM values suggest the presence of the exchange coupling between Co and (CoNi)Fe2O4 nanoparticles.

Original languageEnglish
Pages (from-to)3871-3873
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2005 Oct


  • Alcohol reduction
  • Coprecipitation
  • Ferrite
  • Nanocomposite
  • Recoil

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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