Tunable coercivity of CoFe2O4 nanoparticles via thermal annealing treatment

W. S. Chiu, Shahidan Radiman, Roslan Abd. Shukor, M. H. Abdullah, P. S. Khiew

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

High coercivity magnetic nanoparticles (CoFe2O4) have been synthesized by hydrolysis reaction in a micelle system followed by proper thermal annealing treatment to induce the crystallization. The TEM observations showed that majority of the particles are spherical in shape, fairy monodispersed and the size varied in the range of 10.0-70.0 nm. It was found that higher annealing temperatures favored the ferrite formation with larger size due to the interdiffusion process. The XRD patterns revealed that all the products consisted of nanocrystalline ferrite phase only. The magnetic properties of the products were found greatly affected by the average crystalline size of the nanoparticles. By controlling the thermal annealing treatment, the coercivity (Hc) and saturation magnetization (Ms) of the nanoparticles can be well tuned as a function of temperature. The current synthetic approach offered a novel development for the production of soft magnetic materials.

Original languageEnglish
Pages (from-to)291-297
Number of pages7
JournalJournal of Alloys and Compounds
Volume459
Issue number1-2
DOIs
Publication statusPublished - 14 Jul 2008

Fingerprint

Coercive force
Annealing
Nanoparticles
Ferrite
Soft magnetic materials
Micelles
Saturation magnetization
Crystallization
Hydrolysis
Magnetic properties
Crystalline materials
Transmission electron microscopy
Temperature
cobalt ferrite
Hot Temperature

Keywords

  • Chemical synthesis
  • Coercivity
  • Ferrite
  • Magnetization
  • Nanoparticles

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Tunable coercivity of CoFe2O4 nanoparticles via thermal annealing treatment. / Chiu, W. S.; Radiman, Shahidan; Abd. Shukor, Roslan; Abdullah, M. H.; Khiew, P. S.

In: Journal of Alloys and Compounds, Vol. 459, No. 1-2, 14.07.2008, p. 291-297.

Research output: Contribution to journalArticle

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