Magnetic properties of monodispersed Co/CoO clusters

D. L. Peng, K. Sumiyama, T. Hihara, S. Yamamuro, T. J. Konno

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186 Citations (Scopus)


Monodispersed Co/CoO cluster assemblies with the mean cluster sizes of 6 and 13 nm have been prepared by a plasma-gas condensation type cluster beam deposition apparatus. We measured the effects of the oxygen gas flow rate during deposition, temperature, and cluster size on the coercivity and hysteresis loop shift induced by field cooling. The large exchange bias field (10.2 kOe) and coercivity (5 kOe) were observed at 5 K for the monodispersed Co/CoO cluster assembly with d=6 nm. The correlations between unidirectional anisotropy and uniaxial anisotropy, training effect and magnetic relaxation can be interpreted by the hypothesis of a spin disorder in the interfacial layer between the antiferromagnetic CoO shell and the ferromagnetic Co core.

Original languageEnglish
Pages (from-to)3103-3109
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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