Microstructural and magnetic properties of Ni-Ce nanocomposite particles

Xiangcheng Sun, M. J. Yacaman

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A new type of magnetic core-shell Ni-Ce nanocomposite particles (15-50 nm) are presented. Scanning electron microscope (SEM) images and X-ray energy-dispersive analysis (EDX) spectra indicate that these nanoparticles are strongly magnetic interacting order with chain-like features. Typical HREM images show that many planar defects (i.e., nanotwins and stacking faults) exist in large Ni core zone (10-45 nm); the shell layers (3-5 nm) are consisted of innermost NiCe alloy and outermost NiO oxide. Selected area electron diffraction (SAED) patterns show an indication of well-defined spots characteristic of core-shell nanocomposite materials. Magnetization measurements as a function of magnetic fields and temperatures were performed in a SQUID magnetometer. Superparamagnetic behavior above average blocking temperature (TB) 170 K was exhibited, this superparamagnetic relaxation behavior was found to be modified by interparticle interactions, which depend on the applied field and size distribution. In addition, antiferromagnetic order occurred with a Neél temperature TN of about 11 K. A spin-flop transition was also observed below TN at a certain applied filed. In particular, electron paramagnetic resonance (EPR) spectra at low and room temperature reflected this magnetic order nature associated with this type of core-shell microstructure, coupling with the strong interparticle interaction.

Original languageEnglish (US)
Pages (from-to)95-98
Number of pages4
JournalMaterials Science and Engineering C
Issue number1-2
StatePublished - Oct 20 2001
Externally publishedYes


  • Core-shell
  • Ni-Ce nanocomposite particles
  • Superparamagnetic behavior

ASJC Scopus subject areas

  • General Medicine


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