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Preparation and characterization of Co–Pt bimetallic magnetic nanoparticles

Authors
Journal
Journal of Magnetism and Magnetic Materials
0304-8853
Publisher
Elsevier
Publication Date
Volume
299
Issue
1
Identifiers
DOI: 10.1016/j.jmmm.2005.03.013
Keywords
  • Nanoparticles
  • Cobalt
  • Platinum
  • Magnetic Properties
Disciplines
  • Earth Science
  • Physics

Abstract

Abstract CoPt 3 nanoparticles are synthesized by a two-stage route using NaBH 4 as a reductant. The nanoparticles are characterized by thermogravimetry (TG) and differential thermal analysis (DTA), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Structural and spectroscopic studies show that the nanoparticles adopt a face-centered-cubic (FCC) crystalline structure with an average particle size of 2.6 nm. SQUID studies reveal that as-synthesized nanoparticles are superparamagnetic at room temperature and ferromagnetic at 1.85 K with coercivity of 980 Oe. Annealing of the samples at 500 °C causes an increase of particle size and a decrease of coercivity.

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