Effect of annealing on magnetic properties of Ni 80Fe 20 permalloy nanoparticles prepared by polyol method

G. W. Qin, W. L. Pei, Y. P. Ren, Y. Shimada, Yasushi Endo, Masahiro Yamaguchi, Satoshi Okamoto, Osamu Kitakami

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Ni 80Fe 20 permalloy nanoparticles with narrow size distribution and homogeneous composition have been prepared by the polyol processing at 180 °C for 2 h and their particle sizes can be tunable in the size range of 20∼440 nm by proper addition of K 2PtCl 4 agent. X-ray diffraction results show that the NiFe nanoparticles are of face centered cubic structure. The addition of K 2PtCl 4 does not affect the composition of NiFe NPs but decreases the particle size remarkably. Both saturation magnetization and coercivity of the as-prepared NiFe nanoparticles decrease with decreasing particle size. Annealed at 280 °C, however, the saturation magnetization of various sized NiFe nanoparticles increases drastically and approaches to the bulk for the ∼440 nm NiFe particles, and a maximum coercivity (∼270 Oe) happens at a critical size of ∼50 nm. The magnetic property dependency of these NiFe nanoparticles on annealing has been discussed by considering the surface chemistry.

Original languageEnglish
Pages (from-to)10796-10799
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number12
Publication statusPublished - 2011 Dec 1


  • Annealing
  • Magnetic property
  • Nanoparticles
  • NiFe
  • Polyol method

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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