Inverse magnetocaloric effect in sol-gel derived nanosized cobalt ferrite

E. Veena Gopalan, I. A. Al-Omari, D. Sakthi Kumar, Yasuhiko Yoshida, P. A. Joy, M. R. Anantharaman

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Abstract

The magnetocaloric properties of cobalt ferrite nanoparticles were investigated to evaluate the potential of these materials as magnetic refrigerants. Nanosized cobalt ferrites were synthesized by the method of sol-gel combustion. The nanoparticles were found to be spherical with an average crystallite size of 14 nm. The magnetic entropy change (δSm) calculated indirectly from magnetization isotherms in the temperature region 170-320 K was found to be negative, signifying an inverse magnetocaloric effect in the nanoparticles. The magnitudes of the δSm values were found to be larger when compared to the reported values in the literature for the corresponding ferrite materials in the nanoregime.

Original languageEnglish
Pages (from-to)497-503
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Volume99
Issue number2
DOIs
Publication statusPublished - May 2010

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ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

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