Magnetic properties of graphitically encapsulated nickel nanocrystals

J. H. Hwang*, Vinayak P Dravid, M. H. Teng, J. J. Host, B. R. Elliott, D. L. Johnson, Thomas O Mason

*Corresponding author for this work

Research output: Contribution to journalArticle

209 Scopus citations

Abstract

Graphically encapsulated ferromagnetic Ni nanocrystals have been synthesized via a modified tungsten arc-discharge method. By virtue of the protective graphitic coating, these nanocrystals are stable against environmental degradation, including extended exposure to strong acids. The magnetic properties of the encapsulated particles are characterized with regard to the nanoscale nature of the particles and the influence of the graphitic coating which is believed to be benign insofar as the intrinsic magnetic properties of the encapsulated nanocrystals are concerned. The Curie temperature of graphitically encapsulated Ni nanocrystals is the same as that of microcrystalline Ni. However, saturation magnetization, remanent magnetization, and coercivity of these particles are reduced, for a range of temperatures. The unique features are compared with those of unencapsulated nanocrystalline and coarse microcrystalline nickel particles.

Original languageEnglish (US)
Pages (from-to)1076-1082
Number of pages7
JournalJournal of Materials Research
Volume12
Issue number4
DOIs
StatePublished - Jan 1 1997

ASJC Scopus subject areas

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

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