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

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Abstract

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.

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Funding

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

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Correspondence to M. Kanagaraj.

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Kanagaraj, M., Kokila, I.P., Jeniffer, R.S. et al. Structural Confinement Assisted a Robust Superparamagnetic State in MgNi2O3 and MgNi1.5Co0.5O3 Nanoparticles at Room Temperature. J Supercond Nov Magn 31, 3777–3785 (2018). https://doi.org/10.1007/s10948-018-4652-5

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  • DOI: https://doi.org/10.1007/s10948-018-4652-5

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