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    • Keywords


      Nano-particles; magnetic relaxation; anisotropy

    • Abstract


      Magnetization measurements are reported on a nano-particle sample of Znsubstituted spinel ferrite Fe2.8Zn0.2O4 in the temperature range 20–300 K. Analysis of small-angle neutron scattering data shows the sample to have a log-normal particle size distribution of median diameter 64.4 Å and standard deviation 0.38. Magnetization evolves over a long period of timet going nearly linearly with logt. Magnetic anisotropy, estimated by fitting M-logt curve, shows many fold increase over that of bulk particle sample. Major enhancement owes to disordered moments in surface layer. In the nano-particle state as well increasing amount of Zn causes anisotropy to decrease.

    • Author Affiliations


      Subhash Chander1 Seema Lakhanpal1 Anjali Krishnamurthy1 Bipin K Srivastava1 V K Aswal1 2

      1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
      2. 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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