Superparamagnetic behaviour of γ-Fe2O3 nanoparticles dispersed in a silica matrix

C. Cannas, G. Concas, D. Gatteschi, A. Falqui, A. Musinu, G. Piccaluga*, C. Sangregorio, G. Spano

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


The structural and magnetic properties of two Fe2O3-SiO2 nanocomposites, containing respectively 16.9 and 28.5 wt.% Fe2O3, were investigated. The samples were synthetized by a sol-gel method, using ethylene glycol as a solvent, and heating the gels gradually to 900°C. The procedure allowed us to obtain γ-Fe2O3 nanoparticles homogeneously dispersed in the amorphous silica matrix. The particles have a narrow size distribution and mean sizes from 3 to 6 nm depending on the iron oxide content. The magnetic properties of the samples were investigated by static and dynamic susceptibility measurements. All the samples showed superparamagnetic behaviour. The superparamagnetic relaxation was investigated also by Mössbauer spectroscopy. Hysteresis loops were measured at 2.5 K and both samples showed high values of coercive field. The role of magnetic interparticle interactions on the magnetic properties is discussed.

Original languageEnglish (US)
Pages (from-to)832-838
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number5
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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