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Type: Artigo de periódico
Title: Effects of dipolar interactions on the magnetic properties of gamma-Fe2O3 nanoparticles in the blocked state
Author: Nunes, WC
Cebollada, F
Knobel, M
Zanchet, D
Abstract: 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 gamma-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 Delta M technique. The analysis of the experimental data points to the existence of a demagnetizing role played by the dipolar interaction in the coercive field. (C) 2006 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Journal Of Applied Physics. Amer Inst Physics, v. 99, n. 8, 2006.
Rights: aberto
Identifier DOI: 10.1063/1.2164418
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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