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Magnetic behaviour of nano-particles of Fe2.9Zn0.1O4

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Abstract

DC magnetization measurements are reported in the temperature range 20–100 K on a poly-disperse nano-particle sample of the spinel ferrite Fe2.9Zn0.1O4 with a log-normal size distribution of median diameter 43.6 Å and standard deviation 0.58. Outside a core of ordered spins, moments in surface layer are disordered. Results also show some similarities with conventional spin glasses. Blocking temperature exhibits a near linear variation with two-third power of the applied magnetic field and magnetizationM evolves nearly linearly with logarithm of timet. Magnetic anisotropy has been estimated by analysing theM-logt curve. Anisotropy values show a large increase over that of bulk particle samples. Major contribution to this enhancement comes from the disordered surface spins.

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Authors and Affiliations

  1. Department of Physics, University of Rajasthan, 302 004, Jaipur, India

    Subhash Chander, Sudhish Kumar, Anjali Krishnamurthy, Bipin K. Srivastava & V. K. Aswal

  2. Department of Physics, M.L. Sukhadia University, 313 002, Udaipur, India

    Sudhish Kumar

  3. Solid State Physics Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India

    V. K. Aswal

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  1. Subhash Chander
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  2. Sudhish Kumar
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  3. Anjali Krishnamurthy
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  4. Bipin K. Srivastava
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  5. V. K. Aswal
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Chander, S., Kumar, S., Krishnamurthy, A. et al. Magnetic behaviour of nano-particles of Fe2.9Zn0.1O4 . Pramana - J Phys 61, 617–624 (2003). https://doi.org/10.1007/BF02705484

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  • DOI: https://doi.org/10.1007/BF02705484

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