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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/073/04/0765-0780

    • Keywords

       

      Nanomagnetic particles; superparamagnetism; magnetic fluid; hydrothermal synthesis.

    • Abstract

       

      Mn0.5Zn0.5Fe2O4 ferrite nanoparticles with tunable Curie temperature and saturation magnetization are synthesized using hydrothermal co-precipitation method. Particle size is controlled in the range of 54 to 135 Å by pH and incubation time of the reaction. All the particles exhibit super-paramagnetic behaviour at room temperature. Langevin’s theory incorporating the interparticle interaction was used to fit the virgin curve of particle magnetization. The low-temperature magnetization follows Bloch spin wave theory. Curie temperature derived from magnetic thermogravimetric analysis shows that Curie temperature increases with increasing particle size. Using these particles magnetic fluid is synthesized and magnetic characterization is reported. The monolayer coating of surfactant on particle surface is confirmed using thermogravimetric measurement. The same technique can be extended to study the magnetic phase transition. The Curie temperature derived using this measurement complies with the low-temperature magnetic measurement. The room-temperature and high-temperature magnetization measurements are also studied for magnetic fluid systems. The magnetic parameters derived for fluid are in good agreement with those obtained for the particle system

    • Author Affiliations

       

      Rucha Desai1 Vipul Davariya1 Kinnari Parekh2 3 Ramesh V Upadhyay4

      1. Department of Physics, Bhavnagar University, Bhavnagar 364 002, India
      2. Department of Physics, Indian Institute of Technology Gandhinagar, Gandhinagar, India
      3. Permanent address: Department of Physics, Faculty of Sciences, M.S. University of Baroda, Vadodara 390 002, India
      4. Charotar Institute of Applied Sciences, Education Campus-Changa, Changa 388 421, India
    • Dates

       
  • Pramana – Journal of Physics | News

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