Paper Title:
Magnetic Properties of Fe-Pt Nanoparticle Protected by PVP Polymer
  Abstract

Annealing effect on the magnetic properties of Fe-Pt nanoparticle was investigated. Fe-Pt nanoparticles were synthesized by the chemical reduction of H2PtCl6 and the decomposition of Fe(CO)5 in the presence of PVP polymers. The samples were annealed at several temperatures from 350°C to 600°C and the structural and magnetic properties were studied by TEM, XRD and magnetization measurements. FePt nanoparticles as-synthesized showed super-paramagnetism and annealed samples at temperatures more than 400°C, ferromagnetism. The crystal structure of as-synthesized sample was disordered fcc, but chemically ordered fct, when it was annealed at more than 400°C. The annealing effects are the concatenation or agglomeration of nanoparticles accompanied with the increase in particle diameter and with the ordering of the FePt superlattice. The critical diameter for emergence of ferromagnetism of FePt particle has been considered to be 3.6 to 5.6 nm in mean diameter, under the existence of the ordered L10 phase The blocking temperature as a function of the annealing temperature was investigated.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
2131-2134
DOI
10.4028/www.scientific.net/MSF.475-479.2131
Citation
K. Ohmori, T. Umeda, T. Sakaguchi, M. Doi, P. Huayong, H. Asano, N. Tanaka, M. Matsui, "Magnetic Properties of Fe-Pt Nanoparticle Protected by PVP Polymer", Materials Science Forum, Vols. 475-479, pp. 2131-2134, 2005
Online since
January 2005
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$32.00
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