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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|
|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.|
|Editor:||Amer Inst Physics|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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