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Microstructural and Magnetic Properties of Core-Shell Ni-Ce Nanocomposite Particles Assemblies

Published online by Cambridge University Press:  17 March 2011

Xiang-Cheng Sun ,
J. A. Toledo  and
M. Jose Yacaman
Xiang-Cheng Sun
Affiliation:
Prog. Simulación Molecular, Instituto Mexicano del Petróleo, Lázaro Cárdenas 152#, 07730, D.F. Máxico, México E-mail: [email protected]
J. A. Toledo
Affiliation:
Prog. Simulación Molecular, Instituto Mexicano del Petróleo, Lázaro Cárdenas 152#, 07730, D.F. Máxico, México
M. Jose Yacaman
Affiliation:
ININ, Amsterdam No.46-202, Col. Condesa 06100, D. F.México, México
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Abstract

Novel magnetic core-shell Ni-Ce nanocomposite particles (15-50 nm) are presented. SEM observation indicates a strongly ferromagnetic interacting order with chain-like features among Ni-Ce nanocomposite particle assemblies. Typical HREM image demonstrates that many planar defects (i. e. stacking faults) exist in large Ni core zone (10-45 nm ); the innermost NiCe alloy and outermost NiO oxide exist in the thin shell layers ( 3-5 nm ). Nano-diffraction patterns show an indication of well-defined spots characteristic and confirm the nature of this core-shell nanocomposite particles. Superparamagnetic relaxation behavior above average blocking temperature (TB =170K) for Ni-Ce nanocomposite particles assemblies have been exhibited, this superparamagnetic behavior is found to be modified by interparticle interactions, which depending on the applied field; size distribution and coupling with the strong interparticle interaction. In addition, an antiferromagnetic order occurs with a Neél temperature TN of about 11K due to Ce ion magnetic order fuction. A spin-flop transition is also observed below TN at a certain applied field and low temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 635: Symposium C – Anisotropic Nanoparticles-Synthesis, Characterization & Applications , 2001 , C6.8
Copyright
Copyright © Materials Research Society 2001

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