• SM Yusuf

      Articles written in Pramana – Journal of Physics

    • Local canted spin behaviour in Co1.4−xZnxGe0.4Fe1.2O4 spinels: A macroscopic, mesoscopic and microscopic study

      MV Subbarao SM Yusuf RG Kulkarni L Madhav Rao

      More Details Abstract Fulltext PDF

      DC magnetization, neutron depolarization and neutron diffraction (with both polarized and unpolarized neutrons) measurements have been reported for the Co1.1−xZnxGe0.1Fe1.2O1 spinels with x=0.5, 0.6 and 0.7. Neutron depolarization and neutron diffraction measurements confirm the presence of a long range ferrimagnetic ordering of the local canted spins in these ferrite samples. The observed features of low field magnetization have been explained under the framework of thermally activated domain wall movement of ferrimagnetic arrangement of local canted spins. An important role of magnetic anisotropy (due to the presence of Co2+ ions) in establishing the magnetic ordering and domain kinetics in these ferrites has been observed.

    • ac Conductivity of mixed spinel NiAl0.7Cr0.7Fe0.6O4

      A K Rajarajan SM Yusuf P Balaya RG Kulkarni

      More Details Abstract Fulltext PDF

      ac Conductivity measurements are carried out across the metal to insulator transition in NiAl0.7Cr0.7Fe0.6O4. The low frequency data is analyzed using Summerfield scaling theory for hopping conductivity. The exponent of the scaling behavior has significantly different values in the conducting and insulating regimes. The hopping frequency and the zero frequency conductivity are found to increase with temperature, slowly in the metallic regime and rapidly in the insulating regime.

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