Paper Title:
Synthesis and Characterization of Core-Shell Structured Bimagnetic Cobalt-Coated Iron Nanoparticles
  Abstract

Core-shell structured nanoparticles with ferromagnetic core (Fe) and shell (Co) were prepared by a chemical reduction method. By adjusting the deposition parameters, the core-shell particles with various Fe:Co molar ratios were obtained. The saturation magnetization decreased with the increase of Cobalt content. The properties of core-shell nanoparticles synthesized under a magnetic field were compared with those prepared without a magnetic field. For the nanoparticles prepared without magnetic filed, the coercivity (Hc) increased with increasing Co content due to the large anisotropy of Co, whereas for the nanoparticles prepared under a magnetic field, the Hc was much lower. The ZFC/FC curves suggested that these particles were ferromagnetic at room temperature. The anisotropy constant K at 340K for core-shell nanoparticle is estimated to be 0.83×105 erg/cm3. The second ferromagnetic phase transition may occur at the temperature lower than 25 K, which led to a drastic change of magnetization at low temperatures.

  Info
Periodical
Edited by
Rongming Wang, Ying Wu and Xiaofeng Wu
Pages
370-375
DOI
10.4028/www.scientific.net/MSF.688.370
Citation
K.P. Su, Z. W. Liu, X.X. Shan, Z.G. Zheng, X.C. Zhong, H. Y. Yu, D. C. Zeng, "Synthesis and Characterization of Core-Shell Structured Bimagnetic Cobalt-Coated Iron Nanoparticles", Materials Science Forum, Vol. 688, pp. 370-375, 2011
Online since
June 2011
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