Proteresis in Co:CoO core-shell nanoclusters

X. H. Wei, R. Skomski, Z. G. Sun, D. J. Sellmyer

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12 Scopus citations


The magnetism of ultrasmall Co:CoO core-shell nanoclusters is investigated. The structures, produced by cluster-beam deposition, have Co core sizes ranging from 1 to 7 nm and a CoO shell thickness of about 3 nm. Hysteresis loops as well as zero-field-cooled and field-cooled magnetization curves have been measured and a striking feature of the nanostructures is the existence of proteretic (clockwise) rather than hysteretic loops in the core-size range from 3 to 4 nm. The proteretic behavior and its particle-size dependence reflect a subtle interplay between various anisotropies and exchange interactions in the Co and CoO phases and at the Co-CoO interface.

Original languageEnglish (US)
Article number07D514
JournalJournal of Applied Physics
Issue number7
StatePublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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