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

Nanoparticles of spinel cubic Mn 0.5 Zn 0.5 Fe 2 O 4 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 nanomet...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2018-03, Vol.31 (3), p.815-820
Main Authors: Gurram, Narayana Rao, T., Ramesh, T., Suneetha, Nath, T. K.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Original Paper
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary:Nanoparticles of spinel cubic Mn 0.5 Zn 0.5 Fe 2 O 4 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 Fe 3+ 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.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-017-4257-4