The magnetic properties of annealed graphite-coated Ni and Co nanocrystals

J. A. Block*, J. Parvin, J. L. Alpers, T. Sezen, R. Laduca, J. J. Host, V. P. Dravid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Magnetic studies of graphite-coated nanocrystals of nickel and cobalt (5 - 50 nm) synthesized in a special fullerene arc chamber are reported. Magnetization measurements as a function of temperature in the range 20 - 900 °C indicate the ferromagnetic nature of the nanocrystals. Upon heating and recooling of the nanocrystals a larger magnetization was measured. The dependence of room temperature M., Mr, and Hc of the nanocrystals on annealing temperature is reported. The data are consistent with increase in size of single domain particles, or transition of the nanocrystals from single domain to multi-domain due to particle size growth in the annealing process.

Original languageEnglish (US)
Pages (from-to)982-984
Number of pages3
JournalIEEE Transactions on Magnetics
Volume34
Issue number4 PART 1
DOIs
StatePublished - Dec 1 1998

Keywords

  • Ferromagnets
  • Graphite-coated nanocrystals
  • Single domain particles

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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