Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Preparation and Physical Characterizations of Superparamagnetic Maghemite Nanoparticles

  • Received : 2014.08.19
  • Accepted : 2014.09.22
  • Published : 2014.12.31
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Abstract

Superparamagnetic maghemite nanoparticles were prepared by chemical co-precipitation, followed by a temperate oxidation stage, and investigated using FE-SEM, XRD, TGA, VSM, and M$\ddot{o}$ssbauer spectroscopy. Through SEM image and XRD analysis, its average particle size was found to be 13.9 nm. While VSM magnetic measurement showed typical superparamagnetic behavior at room temperature, M$\ddot{o}$ssbauer spectroscopic investigation revealed that non-vanishing magnetic hyperfine structure were retained. Cation distribution estimated from M$\ddot{o}$ssbauer spectroscopy confirmed the formation of maghemite nanophase in the sample.

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