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Type: Artigo de periódico
Title: Size dependence on the ordering process in colloidal FePt nanoparticles
Author: Vargas, JM
Zysler, RD
Socolovsky, LM
Knobel, M
Zanchet, D
Abstract: An alternative method to study the effects of annealing process on colloidal FePt nanoparticles (2-4 nm) has been achieved. Annealing experiments at temperatures between 773 and 1073 K under inert atmosphere flux were performed in powder samples with excess of surfactant molecules on nanoparticle surface. Transmission electron microscopy, x-ray diffraction and magnetic measurements were performed to evidence the evolution of the chemically disordered fcc to chemically ordered face-centered tetragonal phase transformation. Magnetization measurements under zero-field-cooling and field-cooling (M-ZFC-M-FC) conditions, and hysteresis loops are extremely sensitive to the particle size distribution and were strongly affected by the annealing treatment. (c) 2007 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.2409620
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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