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Magnetic Property of α-Fe₂O₃ Nanoparticles Prepared by Sonochemistry and Take-off Technique

Journal of Magnetics, Volume 15, Number 1, 31 Mar 2010, Pages 21-24

Y. S. Koo (Department of Physics, Inha University), B. K. Yun (Department of Physics, Inha University), J. H. Jung *

(Department of Physics, Inha University)

Abstract

A new synthetic method for the formation of uniform α-Fe₂O₃ nanoparticles was reported and their magnetic properties were investigated. The sonochemical synthesis and the subsequent take-off technique resulted in spherical shaped α-Fe₂O₃nanoparticles with an average diameter of 60 nm. The temperature- and applied magnetic field-dependent magnetization of the α-Fe₂O₃ nanoparticles was explained by the sum of two contributions, i.e., the Morin transition and superparamagnetism, because the critical size for superparamagnetism was within the size variation of the nanoparticles.

Keywords: sonochemical synthesis; α-Fe2O3; Morin transition; superparamagnetism

DOI: 10.4283/JMAG.2010.15.1.021

Full Text: PDF

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