Magnetic multi-granule nanoclusters: A model system that exhibits universal size effect of magnetic coercivity
- Authors
- Lee, Ji Sung; Cha, Jin Myung; Yoon, Ha Young; Lee, Jin-Kyu; Kim, Young Keun
- Issue Date
- 17-7월-2015
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.5
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 5
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93000
- DOI
- 10.1038/srep12135
- ISSN
- 2045-2322
- Abstract
- 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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- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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