Autor(es):
Knobel, Marcelo, 1968- ; Nunes, Wallace de Castro ; Rocha, Tulio Costa Rizuti da, 1979- ; Socolovsky, Leandro Martín
Data: 2007
Identificador Persistente: https://hdl.handle.net/20.500.12733/1666332
Origem: Oasisbr
Assunto(s): Nanocristais; Nanopartículas; Magnetização; Nanocrystals; Nanoparticles; Magnetization; Magnetic properties; Artigo de evento; Nanocristais; Nanocristais; Nanopartículas; Nanopartículas; Magnetização; Magnetização; Nanocrystals; Nanocrystals; Nanoparticles; Nanoparticles; Magnetization; Magnetization; Magnetic properties; Magnetic properties; Artigo de evento; Artigo de evento
Descrição
Agradecimentos: We acknowledge the financial support from FAPESP and CNPq (Brazilian agencies). We are grateful to LMELNLS for the TEM use
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
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
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