Iron oxide shell as the oxidation-resistant layer in SmCo 5@Fe 2O 3 core - Shell magnetic nanoparticles

Xiaowei Teng, Hong Yang

Research output: Contribution to journalArticlepeer-review


This paper presents a synthesis of magnetic nanoparticles of samarium cobalt alloys and the use of iron oxide as a coating layer to prevent the rapid oxidation of as-made Sm-Co nanoparticles. The colloidal nanoparticles of Sm-Co alloys were made in octyl ether using samarium acetylacetonate and dicobalt octacarbonyl as precursors in a mixture of 1,2-hexadecanediol, oleic acid, and trioctylphosphine oxide (TOPO). Such Sm-Co nanoparticle could be readily oxidized by air and formed a CoO antiferromagnetic layer. Exchange biasing was observed for the surface oxidized nanoparticles. In situ thermal decomposition of iron pentacarbonyl was used to create iron oxide shells on the Sm-Co nanoparticles. The iron oxide shell could prevent Sm-Co nanoparticles from rapid oxidation upon the exposure to air at ambient conditions.

Original languageEnglish (US)
Pages (from-to)356-361
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Issue number1
StatePublished - Jan 1 2007
Externally publishedYes


  • Core-Shell Nanoparticle
  • Exchange Biasing
  • Iron Oxide
  • Magnetism
  • Oxidation
  • Samarium Cobalt

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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