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Type: Artigo de periódico
Title: Effects Of Magnetic Interparticle Coupling On The Blocking Temperature Of Ferromagnetic Nanoparticle Arrays
Author: Knobel M.
Nunes W.C.
Winnischofer H.
Rocha T.C.R.
Socolovsky L.M.
Mayorga C.L.
Zanchet D.
Abstract: In this work we report on the study of the magnetic properties of 2D arrays and 3D dispersions of colloidal iron oxide nanoparticles prepared by Langmuir-Blodgett technique and by dilution in paraffin wax solid solution, respectively. The influence of magnetic interparticle coupling on the superparamagnetic relaxation behavior was investigated by means of DC magnetization measurements. A quantitative analysis of the field dependence of the blocking temperature and the role of the interparticle coupling is presented. We explain our results using a phenomenological model based on the random anisotropy and micromagnetic theories that account for particle coupling effects in the superparamagnetic properties. © 2007 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.jnoncrysol.2006.12.037
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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