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Effects of dipolar interactions on the magnetic properties of γ-Fe2O3 nanoparticles in the blocked state

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4 Author(s)
Nunes, W.C. ; Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), C.P. 6165, Campinas, São Paulo, Brazil ; Cebollada, F. ; Knobel, M. ; Zanchet, D.

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The role played by dipolar interactions in the coercive field and remanence of nanoparticle systems is studied using different concentrations of nearly monodisperse nanoparticles of γ-Fe2O3. The 9.0 nm particles are isolated by organic encapsulation and diluted in paraffin. Magnetic properties were investigated by means of hysteresis obtained at different temperatures, zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves, and the so-called ΔM technique. The analysis of the experimental data points to the existence of a demagnetizing role played by the dipolar interaction in the coercive field.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 8 )

Date of Publication:

Apr 2006

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