Structural Confinement Assisted a Robust Superparamagnetic State in MgNi2O3 and MgNi1.5Co0.5O3 Nanoparticles at Room Temperature

  • M. Kanagaraj
  • I. Phebe Kokila
  • R. Sofia Jeniffer
  • P. Sathish Kumar
  • Helen Annal Therese
  • M. Kumaresavanji
  • C. Sekar
Original Paper


In this study, ideal spherical-shaped cubic metal oxide nanoparticles of < 30 nm in size were prepared by a citric acid sol-gel combustion method. The detailed structural analysis and microscopic techniques clearly support the existing grade of structural confinement effect in MgNi2O3 and MgNi1.5Co0.5O3. Temperature-dependent magnetisation studies at various applied fields revealed a moderate change of TB near room temperature by distinct particle size. Magnetic crystalline anisotropy and energy barrier density theoretical model results suggested the importance of innermost magnetic particle stability-aided spin orientation with a fascinating magnetic moment in superparamagnetic region exerted by Ni and Co remarkably postured as a significant part of these nanoparticles.


Magnetic nanoparticle Sol-gel technique X-ray diffraction Structural confinement Superparamagnetism Magnetic crystalline anisotropy 


Funding Information

The author M. Kumaresavanji acknowledges the FCT, Portugal for grant No. SFRH/BPD/75110/2010.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • M. Kanagaraj
    • 1
  • I. Phebe Kokila
    • 2
  • R. Sofia Jeniffer
    • 1
  • P. Sathish Kumar
    • 3
  • Helen Annal Therese
    • 2
  • M. Kumaresavanji
    • 4
  • C. Sekar
    • 5
  1. 1.Department of PhysicsKarpagam UniversityCoimbatoreIndia
  2. 2.Nanotechnology Research CentreSRM UniversityKattankulathur, Kancheepuram DistrictIndia
  3. 3.School of Advanced SciencesVIT UniversityVelloreIndia
  4. 4.IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy, Faculty of SciencesUniversity of PortoPortoPortugal
  5. 5.Department of Bioelectronics and BiosensorsAlagappa UniversityKaraikudiIndia

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