Magnetic superlattices and their nanoscale phase transition effects

被引:84
作者
Cheon, J [1 ]
Park, JI
Choi, JS
Jun, YW
Kim, S
Kim, MG
Kim, YM
Kim, YJ
机构
[1] Yonsei Univ, Dept Chem & NanoMed, Natl Core Res Ctr, Seoul 120749, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea
[3] Pohang Accelerator Lab, Pohang 790784, South Korea
[4] Korea Basic Sci Inst, Div Nanomat & Environm Sci, Taejon 305333, South Korea
关键词
binary superlattices; magnetic nanoparticle;
D O I
10.1073/pnas.0508877103
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The systematic assembly of nanoscale constituents into highly ordered superlattices is of significant interest because of the potential of their multifunctionalities and the discovery of new collective properties. However, Successful observations of such superlattice-associated nanoscale phenomena are still elusive. Here, we present magnetic superlattices of Co and Fe3O4 nanoparticles with multidimensional symmetry of either AB (NaCl) or AB(2) (AlB2). The discovery of significant enhancement (approximate to 25 times) of ferrimagnetism is further revealed by forming previously undescribed superlattices of magnetically soft-hard Fe3O4@COFe2O4 through the confined geometrical effect of thermally driven intrasuperlattice phase transition between the nanoparticulate components.
引用
收藏
页码:3023 / 3027
页数:5
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