Hierarchical assembly of magnetic L1o-ordered FePt nanoparticles in block copolymer thin films

被引:16
作者
Aissou, Karim [1 ]
Alnasser, Thomas [2 ]
Pecastaings, Gilles [1 ]
Goglio, Graziella [2 ]
Toulemonde, Olivier [2 ]
Mornet, Stephane [2 ]
Fleury, Guillaume [1 ]
Hadziioannou, Georges [1 ]
机构
[1] Univ Bordeaux, CNRS, LCPO, UMR 5629, F-33600 Pessac, France
[2] Univ Bordeaux, CNRS, ICMCB, UPR 9058, F-33600 Pessac, France
关键词
PHASE-TRANSFORMATION;
D O I
10.1039/c2tc00490a
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The self-assembly process and local magnetic properties of asymmetric poly(styrene-block-ethylene oxide) (PS-b-PEO) copolymer thin films blended with L1(o)-ordered FePt nanoparticles are studied. During the solvent annealing process, it is shown that L1(o)-ordered FePt nanoparticles covered with short dopamine-terminated-methoxy poly(ethylene oxide) (mPEO-Dopa) are localized within spherical PEO domains having an inter-domain spacing of about 43.2 nm. The magnetic properties of the nanocomposite thin films were then investigated using magnetic force microscopy (MFM). MFM results reveal that each spot (magnetic signal), resulting from the presence of ferromagnetic NPs (coercive field, H-c similar to 2000 Oe at 300 K), is fully contained in a PEO sphere leading to readily discernible magnetic nanodomains (bits).
引用
收藏
页码:1317 / 1321
页数:5
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