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Inverse magnetocaloric effect in sol–gel derived nanosized cobalt ferrite

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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 (ΔS m) 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 ΔS m values were found to be larger when compared to the reported values in the literature for the corresponding ferrite materials in the nanoregime.

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Authors and Affiliations

  1. Department of Physics, Cochin University of Science and Technology, Cochin, 682 022, Kerala, India

    E. Veena Gopalan & M. R. Anantharaman

  2. Department of Physics, College of Sciences, Sultan Qaboos University, PO Box 36, PC 123, Muscat, Oman

    I. A. Al-Omari

  3. Bio-Nano Electronics Research Centre, Department of Applied Chemistry, Toyo University, Kawagoe, Saitama, 350-8585, Japan

    D. Sakthi Kumar & Yasuhiko Yoshida

  4. Physical Chemistry Division, National Chemical Laboratory, Pune, 411 008, India

    P. A. Joy

Authors
  1. E. Veena Gopalan
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  2. I. A. Al-Omari
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  3. D. Sakthi Kumar
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  4. Yasuhiko Yoshida
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  5. P. A. Joy
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  6. M. R. Anantharaman
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Correspondence to M. R. Anantharaman.

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Gopalan, E.V., Al-Omari, I.A., Kumar, D.S. et al. Inverse magnetocaloric effect in sol–gel derived nanosized cobalt ferrite. Appl. Phys. A 99, 497–503 (2010). https://doi.org/10.1007/s00339-010-5573-8

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  • DOI: https://doi.org/10.1007/s00339-010-5573-8

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