• Seema Lakhanpal

      Articles written in Pramana – Journal of Physics

    • Magnetic behaviour of nano-particles of Fe2.8Zn0.2O4

      Subhash Chander Seema Lakhanpal Anjali Krishnamurthy Bipin K Srivastava V K Aswal

      More Details Abstract Fulltext PDF

      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.

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