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

Research output: Contribution to journalArticle

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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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Magnetocaloric effects
Sol-gels
Ferrite
Cobalt
Nanoparticles
Ferrites
Refrigerants
Crystallite size
Isotherms
Magnetization
Entropy
cobalt ferrite
Temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

Cite this

Inverse magnetocaloric effect in sol-gel derived nanosized cobalt ferrite. / Gopalan, E. Veena; Al-Omari, I. A.; Kumar, D. Sakthi; Yoshida, Yasuhiko; Joy, P. A.; Anantharaman, M. R.

In: Applied Physics A: Materials Science and Processing, Vol. 99, No. 2, 05.2010, p. 497-503.

Research output: Contribution to journalArticle

Gopalan, E. Veena ; Al-Omari, I. A. ; Kumar, D. Sakthi ; Yoshida, Yasuhiko ; Joy, P. A. ; Anantharaman, M. R. / Inverse magnetocaloric effect in sol-gel derived nanosized cobalt ferrite. In: Applied Physics A: Materials Science and Processing. 2010 ; Vol. 99, No. 2. pp. 497-503.
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