Magnetic properties of nanoparticles of cobalt chromite

Chandana Rath, P. Mohanty, A. Banerjee

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Magnetic properties of cobalt chromite nanoparticles of size 812 nm synthesized through conventional coprecipitation route are reported. Magnetization versus temperature measurement plot reveals a transition from paramagnetic to superparamagnetic (SPM) phase in contrast with the transition from paramagnetic to long-range ferrimagnetic phase at Curie temperature, T c, reported in bulk. The blocking temperature, Tb, of SPM phase is found to be 5060 K. On cooling in the presence of 10 kOe field these nanoparticles show an enhancement in coercivity and shifting of loop at 10 K, which is absent at 50 K. While the later observation supports the blocking temperature of the SPM phase, the former one is attributed to a disordered spin configuration at the surfaces and the distribution of nanoparticle sizes.

Original languageEnglish
Pages (from-to)1698-1702
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number12
DOIs
Publication statusPublished - Jun 2011
Externally publishedYes

Keywords

  • Chromite
  • Exchange bias
  • Nanoparticle
  • Spinel
  • Superparamagnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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