Large Magnetocaloric Effect, Moment, and Coercivity Enhancement after Coating Ni Nanoparticles with Ag

Authors

  • Dr. Sanyadanam Srinath,

    1. School of Physics, University of Hyderabad, Hyderabad 500046 (India)
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  • Dr. Pankaj Poddar,

    Corresponding author
    1. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008 (India)
    2. Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110 001 (India)
    • Pankaj Poddar, Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008 (India)===

      Hariharan Srikanth, Functional Materials Laboratory, Department of Physics, University of South Florida, Tampa, FL 33620 (USA)===

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  • Raja Das,

    1. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008 (India)
    2. Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110 001 (India)
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  • Dr. Deepti Sidhaye,

    1. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008 (India)
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  • Dr. Bhagavatula Lakshmi Vara Prasad,

    1. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008 (India)
    2. Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, 2 Rafi Marg, New Delhi 110 001 (India)
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  • Dr. James Gass,

    1. Functional Materials Laboratory, Department of Physics, University of South Florida, Tampa, FL 33620 (USA)
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  • Prof. Hariharan Srikanth

    Corresponding author
    1. Functional Materials Laboratory, Department of Physics, University of South Florida, Tampa, FL 33620 (USA)
    • Pankaj Poddar, Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008 (India)===

      Hariharan Srikanth, Functional Materials Laboratory, Department of Physics, University of South Florida, Tampa, FL 33620 (USA)===

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Errata

This article is corrected by:

  1. Errata: Corrigendum: Large Magnetocaloric Effect, Moment, and Coercivity Enhancement after Coating Ni Nanoparticles with Ag Article first published online: 11 December 2014

Abstract

We observe a large magnetocaloric effect in monodisperse Ni and NicoreAgshell nanoparticles in the superparamagnetic region. The organically passivated Ni nanospheres show a large magnetic entropy change of 0.9 J kg−1 K for a 3 T magnetic field change. In comparison to the surfactant-coated Ni nanoparticles, the NicoreAgshell nanoparticles show an enhanced coercivity, magnetization, and magnetocaloric effect (1.3 kg K for a 3 T magnetic field change). The coercivity at 10 K increases from 360 Oe for Ni nanoparticles to nearly 610 Oe for NicoreAgshell particles. This large enhancement is attributed to the enhanced inter-particle interaction, which is mediated by the metallic shell, over the relatively weaker dipolar interaction in the surfactant-coated Ni nanoparticles, and to modification of the surface spin structure.

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