Rev.Adv.Mater.Sci.(RAMS)
No 5, Vol. 5, 2003, pages 477-480

SUPERPARAMAGNETIC RELAXATION IN COBALT FERRITE NANOPARTICLES SYSNTHESIZED FROM HYDROXIDE CARBONATE PRECURSORS

Y. Ahn1, E.J. Choi1 and E.H. Kim2

1 Department of Chemistry, Konyang University, Nonsan, Chungnam, 320-711, Korea
2 Division of Mineral Utilization Korea Institute of Geoscience & Mineral
Resources, Daejon, 305-350, Korea

Abstract

Cobalt ferrite nanoparticles having various sizes have been synthesized from hydroxide carbonate precursors. The Mossbauer absorption patterns of all the samples consist of a ferromagnetic component superposed on a superparamagnetic doublet. The intensity of the superparamagnetic doublet is smaller for particles having large average particle size and the Curie temperatures increase linearly with increasing average particle size.

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