Thermal variation of the relaxation time of the magnetic moment of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi></math>-<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Fe</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math> nanoparticles with interparticle interactions of various strengths

J. L. Dormann; F. D'Orazio; F. Lucari; E. Tronc; P. Prené; J. P. Jolivet; D. Fiorani; R. Cherkaoui; M. Noguès

doi:10.1103/PhysRevB.53.14291

Thermal variation of the relaxation time of the magnetic moment of $γ$ - ${Fe}_{2}$ $O_{3}$ nanoparticles with interparticle interactions of various strengths

J. L. Dormann, F. D'Orazio, F. Lucari, E. Tronc, P. Prené, J. P. Jolivet, D. Fiorani, R. Cherkaoui, and M. Noguès

Phys. Rev. B 53, 14291 – Published 1 June 1996

Abstract

The dynamical properties of $γ$ - ${Fe}_{2}$ $O_{3}$ particles, dispersed in a polymer, were investigated by ac susceptibility ( $2 \times 10^{- 2} Hz <~ ν <~ 10^{4} Hz$ ) and Mössbauer spectroscopy measurements. The variation of the average blocking temperature as a function of the measuring time is satisfactorily described by a model which accounts for interparticle interactions by a statistical calculation of the dipolar energy for a disordered assembly of particles with a volume distribution and easy axes in random position.

Received 12 January 1996

DOI:https://doi.org/10.1103/PhysRevB.53.14291

Authors & Affiliations

J. L. Dormann

Laboratoire de Magnétisme et d'Optique, CNRS-Université de Versailles-St. Quentin, 45 avenue des Etats-Unis, 78035 Versailles-Cedex, France

F. D'Orazio and F. Lucari

Dipartimento di Fisica, Universita, 67100 L'Aquila, Italy

E. Tronc, P. Prené, and J. P. Jolivet

Laboratoire de Chimie de la Matière Condensée (URA 1466), Université Pierre et Marie Curie, 75252 Paris Cedex 05, France

D. Fiorani

Istituto di Chimica dei Materiali, CP 10, 00016 Monterotondo Stazione, Italy

R. Cherkaoui^* and M. Noguès

Laboratoire de Magnétisme et d'Optique, CNRS-Université de Versailles-St. Quentin, 45 avenue des Etats-Unis, 78035 Versailles-Cedex, France

^*On leave from Laboratoire de Physique des Matériaux, Département de Physique, Université Mohamed V, avenue Ibn Batouta-B.P.1014-Rabat, Maroc.

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Vol. 53, Iss. 21 — 1 June 1996

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