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Philosophical Magazine B Volume 76, 1997 - Issue 4
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Original Articles

Dynamic properties of interacting SgM-Fe2O3 particles

D. Fiorani Istituto di Chimica dei Materiali, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Cp 10, 00016, Monterotondo, Italy
,
J. L. Dormann Laboratoire de Magnetisme et D'Optique, CNRS, Universite de Versailles, St Quentin, 45 Avenue des Etats-Unis, 78035, Versailles, Cedex, France
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F. Lucari Dipartimento di Fisica, Universite, 67100, L'Aquila, Italy
,
F. D'orazio Dipartimento di Fisica, Universite, 67100, L'Aquila, Italy
,
E. Tronc Laboratoire de Chimie de la Matieère Condensee (Unité de Recherche associee au Cnrs 1466), Université Pierre et Marie Curie, 75252, Paris, Cedex, 05, France
,
P. Prené Laboratoire de Chimie de la Matieère Condensee (Unité de Recherche associee au Cnrs 1466), Université Pierre et Marie Curie, 75252, Paris, Cedex, 05, France
,
J. P. Jolivet Laboratoire de Chimie de la Matieère Condensee (Unité de Recherche associee au Cnrs 1466), Université Pierre et Marie Curie, 75252, Paris, Cedex, 05, France
&
A. M. Testa Istituto di Chimica dei Materiali, Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Cp 10, 00016, Monterotondo, Italy
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Pages 457-462 | Published online: 27 Sep 2006
 
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Abstract

The dynamic properties of a series of samples of γ-Fe2O3 particles with different aggregation states in a polymer mixture have been investigated by magnetization, ac susceptibility and Mossbauer spectroscopy measurements. The frequency dependence of the blocking temperature is satisfactorily described by a model based on a statistical calculation of the dipolar energy for a disordered assembly of particles with a volume distribution and easy axes in random directions.

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