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http://dx.doi.org/10.4283/JMAG.2014.19.4.323

Preparation and Physical Characterizations of Superparamagnetic Maghemite Nanoparticles  

Yoon, Sunghyun (Department of Physics, Gunsan National University)
Publication Information
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.
Keywords
superparamagnetism; maghemite nanoparticles; cation distribution; M$\ddot{o}$ssbauer spectroscopy;
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