Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep12135
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Funding
- National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [2014M3A7B4052193, 2013K2A1A7076318, 2012-0009552]
- National Research Foundation of Korea [2014M3A7B4052193] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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It is well known that the coercivity of magnetic nanomaterials increases up to a maximum and then decreases to zero with decreasing particle size. However, until now, no single synthesis method has been able to produce magnetic nanoparticles with a wide range of sizes, i.e., from 10 to 500 nm, in order to uncover the coercivity evolution. Here we report the characterization of magnetite (Fe3O4) multi-granule nanoclusters (MGNCs) to demonstrate the transitional behaviour of coercivity. The M-H curves indicate that our samples had a relatively high saturation magnetization (M-S) value of similar to 70 emu/g and that the coercivity (H-c) increased to the maximum value of similar to 48 Oe until the nanoclusters reached a size of similar to 120 nm; the coercivity then gradually decreased to zero.
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