Magnetic Trapping And Self-Assembly Of Multicomponent Nanowires
JOURNAL OF APPLIED PHYSICS(2002)
摘要
Magnetic nanowires suspended in fluid solutions can be assembled and ordered by taking advantage of their large shape anisotropy. Magnetic manipulation and assembly techniques are demonstrated, using electrodeposited Ni nanowires, with diameter 350 nm and length 12 mum. Orienting suspended nanowires in a small magnetic field Happroximate to10 G promotes self-assembly of continuous chains that can extend over several hundred mum. The dynamics of this process can be described quantitatively in terms of the interplay of magnetic forces and fluid drag at low Reynolds number. In addition, a new technique of magnetic trapping is described, by which a single magnetic nanowire can be captured between lithographically patterned magnetic microelectrodes. The use of three-segment Pt-Ni-Pt nanowires yields low resistance, Ohmic electrical contacts between the nanowires and the electrodes. This technique has potential for use in the fabrication and measurement of nanoscale magnetic devices. (C) 2002 American Institute of Physics.
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关键词
self assembly,low reynolds number,magnetic properties,optical microscopy,ohmic contact,magnetic particle,nickel,magnetic field,nanocrystalline material,nanowires,scanning electron microscopy
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