| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Size Segregation and Super-Domain Mediated by Dipolar Interactions in 3-D Iron Nanoparticle Assemblies |
| SI Ping-Zhan1**,WANG Hai-Xia1,JIANG Wei1,CHEN Chun-Qiang1,HU Xiu-Kun1,LIU Jin-Jun2,LEE Jung-Goo3,CHOI Chul-Jin3 |
1School of Materials Science and Engineering, China Jiliang University, Hangzhou 310018
2Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211
3Korea Institute of Materials Science, Changwon, Gyeongnam, 641-831, R. Korea |
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| Cite this article: |
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SI Ping-Zhan**, WANG Hai-Xia, JIANG Wei et al 2012 Chin. Phys. Lett. 29 047502 |
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Abstract We report the phenomenon of size segregation and the experimental evidence for the presence of correlated areas mediated by dipolar interactions in three-dimensional Fe nanoparticle assemblies. Iron nanoparticles dispersed in ethanol assemble into tabular whiskers (8µm×40µm in cross section with lengths up to 10 cm) due to dipolar interactions. Magnetic force microscopy observations on iron nanoparticle compact assemblies prove the local magnetic correlation of the Fe nanoparticles due to dipolar coupling and the formation of domain-like structures in expanded dimensions. Magnetic measurements show that the coercivity and the low field magnetic susceptibility of the Fe nanoparticle assemblies increase while the saturation magnetization decreases with the increasing inter-particle distance.
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| Keywords:
75.75.Fk
68.37.Hk
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Received: 27 September 2011
Published: 04 April 2012
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| PACS: |
75.75.Fk
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(Domain structures in nanoparticles)
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68.37.Hk
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(Scanning electron microscopy (SEM) (including EBIC))
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