Microstructural and magnetic properties of core-shell Ni-Ce nanocomposite particles assemblies

Xiang Cheng Sun, J. A. Toledo, M. Jose Yacaman

Research output: Contribution to journalArticlepeer-review


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 behaviour above average blocking temperature (TB =170K) for Ni-Ce nanocomposite particles assemblies have been exhibited, this superparamagnetic behaviour 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 temperatu re TN of about 11K due to Ce ion magnetic order ruction. A spin-flop transition is also observed below TN at a certain applied field and low temperature.

Original languageEnglish (US)
Pages (from-to)C681-C686
JournalMaterials Research Society Symposium - Proceedings
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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