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Investigation of Superparamagnetism in Microwave and Conventional Processed Mn0.5Zn0.5Fe2O4 Nanoparticles

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Abstract

Nanoparticles of spinel cubic Mn0.5Zn0.5Fe2O4 are first prepared by the coprecipitation method and then subjected to conventional solid-state sintering and microwave processing techniques. Particle sizes are estimated by field emission scanning electron microscopy (FESEM) to be in the nanometer (5–13 nm) range. Transmission electron microscopy (TEM) also supports the FESEM data. The magnetization measurement by vibration sample magnetometry of the conventionally sintered sample shows a paramagnetic nature at room temperature, a superparamagnetic behaviour at low temperature, and a ferromagnetic nature at even lower temperature. The blocking temperature is estimated to be nearly 110 K. Microwave-processed samples show a superparamagnetic nature even at room temperature. The Fe3+ cations are found at both the sites confirmed by X-ray photoelectron spectroscopy (XPS), are prepared by microwave processing, and have better magnetic properties as compared to the conventionally sintered particles.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India

    Narayana Rao Gurram

  2. Department of Physics, BVRIT Hyderabad College of Engineering for Women, Hyderabad, India

    Ramesh T.

  3. Department of Physics, Indian Institute of Technology Delhi, New Delhi, India

    Suneetha T.

  4. Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, India

    T. K. Nath

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  1. Narayana Rao Gurram
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  2. Ramesh T.
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  3. Suneetha T.
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  4. T. K. Nath
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Correspondence to Suneetha T..

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Gurram, N., T., R., T., S. et al. Investigation of Superparamagnetism in Microwave and Conventional Processed Mn0.5Zn0.5Fe2O4 Nanoparticles. J Supercond Nov Magn 31, 815–820 (2018). https://doi.org/10.1007/s10948-017-4257-4

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  • DOI: https://doi.org/10.1007/s10948-017-4257-4

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