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Novel behavior in the M–H and field cooled (FC) curves of the MnFe2O4 nanoparticles synthesized by the coprecipitation method

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Abstract

MnFe2O4 nanoparticles were prepared by a coprecipitation chemical method. The average size of the obtained nanoparticles was about 30 nm. The hysteresis measured at T=300 K clearly shows ferromagnetic order at room temperature while that measured at T=450 K shows superparamagnetic behavior. The difference in the magnetization curves in the field increasing cycle and field decreasing cycle at higher temperatures (450 K or higher) is very unusual. In this case, a hysteresis in magnetization in higher magnetic fields with an opening up of the magnetization curve was observed. In this work, the effect of temperature and time of application of the applied field on the magnetization behavior was studied.

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Acknowledgements

The authors appreciate Professor Arthur Yelon for his valuable comments and kind guidance. Also, we appreciate Professor David Menard for his support and we thank the Magnetic Laboratory of “Ecole Polytechnique de Montréal,” Department of Physics Engineering, Montreal, Canada, in which we carried out our magnetic measurements.

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Authors and Affiliations

  1. Department of Physics, K.N. Toosi University of Technology, Tehran, P.O. Box 15875-4416, Iran

    Mehdi Vaez-zadeh & Ali Mohammadi

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  1. Mehdi Vaez-zadeh
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  2. Ali Mohammadi
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Correspondence to Mehdi Vaez-zadeh.

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Vaez-zadeh, M., Mohammadi, A. Novel behavior in the M–H and field cooled (FC) curves of the MnFe2O4 nanoparticles synthesized by the coprecipitation method. Appl. Phys. A 115, 341–345 (2014). https://doi.org/10.1007/s00339-013-7827-8

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  • DOI: https://doi.org/10.1007/s00339-013-7827-8

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