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    • Keywords


      Magnetism; magnetic relaxation; nano-particles; spinel ferrites

    • 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.

    • Author Affiliations


      Subhash Chander1 Sudhish Kumar1 2 Anjali Krishnamurthy1 Bipin K Srivastava1 V K Aswal1 3

      1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
      2. Department of Physics, M.L. Sukhadia University, Udaipur - 313 002, India
      3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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