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Evidence of Superparamagnetism in Mg0.5Mn0.5Fe2O4 Nanosized Ferrite

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Abstract

Nanosized Mg0.5Mn0.5Fe2O4 spinel ferrite was produced via a glycol-thermal route from high-purity metal chlorides. X-ray powder diffraction and transmission electron microscope were used to investigate the structure and morphology of the compound. The results show formation of single-phase structure with average particle size of about 8.6 nm. The Brunauer-Emmett-Teller (BET) specific surface area and mesopore volume was found to be 86.9 and 0.21 cm3g−1 respectively. The evolution of the magnetic properties as a function of measuring temperature was investigated by using a cryogen-free measurement of vibrating sample magnetometer (VSM) system. The results indicate a superparamagnetic behaviour of the sample. The results also show the coercive field, saturation and remanent magnetizations, experimental magnetic moment and squareness of the loops increased with decreasing temperatures.

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Acknowledgments

The authors wish to thank the National Research Foundation (NRF) of South Africa for the VSM equipment grants. One of the authors (HMI) is grateful to the University of Al Fashir for the study leave.

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Authors and Affiliations

  1. School of Chemistry and Physics, Westville Campus, University of KwaZulu-Natal, Durban, 4000, South Africa

    Hafiz M. I. Abdallah & Thomas Moyo

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  1. Hafiz M. I. Abdallah
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  2. Thomas Moyo
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Correspondence to Hafiz M. I. Abdallah.

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I. Abdallah, H.M., Moyo, T. Evidence of Superparamagnetism in Mg0.5Mn0.5Fe2O4 Nanosized Ferrite. J Supercond Nov Magn 28, 955–960 (2015). https://doi.org/10.1007/s10948-014-2782-y

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  • DOI: https://doi.org/10.1007/s10948-014-2782-y

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