Size Segregation and Super-Domain Mediated by Dipolar Interactions in 3-D Iron Nanoparticle Assemblies  

作　　者：SI Ping-Zhan WANG Hai-Xia JIANG Wei CHEN Chun-Qiang HU Xiu-Kun LIU Jin-Jun LEE Jung-Goo CHOI Chul-Jin 司平占;王海霞;姜巍;陈春强;胡秀坤;刘进军;LEE Jung-Goo;CHOI Chul-Jin(School of Materials Science and Engineering,China Jiliang University,Hangzhou 310018;Faculty of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211;Korea Institute of Materials Science,Changwon,Gyeongnam,641-831,R.Korea)

机构地区：[1]School of Materials Science and Engineering,China Jiliang University,Hangzhou 310018 [2]Faculty of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211 [3]Korea Institute of Materials Science,Changwon,Gyeongnam,641-831,R.Korea

出　　处：《Chinese Physics Letters》2012年第4期192-194,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10874159,11074227 and 50801039;Zhejiang Natural Science Foundation(R6110362);the Fundamental R&D Program for Core Technology of Materials by the Ministry of Knowledge Economy,R.Korea.

摘　　要：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 (8 μm × 40 μm in cross section with lengths up to 1 0 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 interparticle distance.

关 键 词：nanoparticles PARTICLE NANOPARTICLE 

分 类 号：TB3[一般工业技术—材料科学与工程]