Crystal size and magnetic field effects in Co3 O4 antiferromagnetic nanocrystals

T. Mousavand, T. Naka, K. Sato, S. Ohara, M. Umetsu, S. Takami, T. Nakane, A. Matsushita, T. Adschiri

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)


We report magnetism of spinel Co3 O4 nanocrystals with average diameters of ∼25 and ∼100□nm under magnetic fields up to 50 kOe. The nanoparticles were controlled to be cubic in shape. In the smaller nanocrystal sample (d∼25□nm), a spontaneous magnetic moment increased steeply below the Néel point, TN =32□K of the bulk sample, whereas similar to bulk samples the larger crystal sample (d∼100□nm) exhibited a maximum in magnetization around TN. A spin-glass-like behavior in magnetization was observed at Tt =10□K at lower magnetic fields, whereas above H=30□kOe, this behavior disappeared.

Original languageEnglish
Article number144411
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
Publication statusPublished - 2009 Apr 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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