Abstract
Single and tubular clustered magnetite nanoparticles (MNPs) were synthesized either by low-temperature coprecipitation or high-temperature hydrothermal in aqueous conditions. The size of the constitutive small nanoparticles (NPs) in two samples is almost same. Room-temperature and low-temperature magnetic measurements show that the two different MNPs have a closed saturation magnetization. In contrast, single MNPs displays a superparamagnetic but the clustered MNPs exhibit a clearly ferromagnetic behaviors, and its coercivity origin have been calculated. The results reveal that the competition of the demagnetization energy of shape and the magnetocrystalline anisotropy energy of small MNPs will increase the coercivity, and the magnetic properties are strongly influenced by the morphology of the magnetite nanocrystals.
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Acknowledgements
The author thanks the NSFC (10905043, 11005082, 91026014, 11175133, and 51171132), the Foundations from Chinese Ministry of Education (311003, 20100141120042, and 20110141130004), the Open Research Fund of State Key Laboratory of Electronic Thin Films and Integrated Devices (UESTC) (KFJJ201004), China Postdoctoral Science Foundation (2012M511257), and the Fundamental Research Funds for the Central Universities, Hubei Provincial Natural Science Foundation (2011CDB270).
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Wu, W., Xiao, X.H., Ren, F. et al. A Comparative Study of the Magnetic Behavior of Single and Tubular Clustered Magnetite Nanoparticles. J Low Temp Phys 168, 306–313 (2012). https://doi.org/10.1007/s10909-012-0634-3
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DOI: https://doi.org/10.1007/s10909-012-0634-3