Investigations on magnetic properties and structure for carbon encapsulated nanoparticles of Fe, Co, Ni

Xiangcheng Sun, A. Gutierrez, M. Jose Yacaman, Xinglong Dong, Shouri Jin

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

In the present work, experiments aim at the encapsulation of foreign materials within hollow graphitic cage have been carried out for iron group metals (Fe, Co, Ni) using a modified arc-discharge (carbon arc) reactor. HRTEM (high resolution transmission electron miscroscope), and XRD (X-ray diffractometer) studies, for three carbon encapsulated materials, showing nanoparticles of both a metallic phase (α-Fe, γ-Fe; hcp-Co, fcc-Co; fcc-Ni) and also a carbide phase (M3C, M=Fe, Co, Ni) are encapsulated in graphitic carbon. The magnetic measurement for the three as-made nanoparticles, indicating that the values of saturation magnetic moment of three nanoparticle are 37.6, 55.5 and 15.7% of the bulk ferromagnetic elements counterparts, respectively. The different comparison values (Mr/Ms) of remanent magnetization (Mr) and saturation magnetization (Ms) suggest, the encapsulated Fe and Co nanoparticles are shown to be ferromagnetic with a ratio of remnant to saturation magnetization Mr/Ms~0.3; whereas, the encapsulated Ni nanoparticles exhibits superparamagnetic behavior at room temperature.

Original languageEnglish (US)
Pages (from-to)157-160
Number of pages4
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume286
Issue number1
DOIs
StatePublished - Jun 30 2000
Externally publishedYes

Keywords

  • Carbon encapsulated nanoparticles
  • Magnetic properities
  • Superparamagnetic

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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