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Nanoscale characterization of CoPt/Pt multilayer nanowires

Yong Peng1,2, Tony Cullis2, Günter Möbus1, Xiaojing Xu1 and Beverley Inkson1

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CoPt/Pt multilayer nanowires have been successfully fabricated by a dc electrodeposition technique into anodic aluminium oxide (AAO) templates, and their chemistry and crystal structure characterized at the nanoscale. It was found that each individual multilayered nanowire had a regular periodic structure like bamboo. However, the periodicity of diverse nanowires from the same specimen varied in magnitude. The Pt layers grew to the full width of the AAO template. However, the cobalt-rich layers in each nanowire did not fully fill the template pores during growth, resulting in a repeatably oscillating nanowire diameter. The chemical composition of multilayer nanowires was measured to be (Co72Pt28/Pt)n. Both the Co72Pt28 and Pt layers were polycrystalline, consisting of fcc nanocrystals <5 nm in size. The variable nanowire periodicity and wire diameter will result in variable mechanical strength, resistance and GMR effect.


PACS

81.07.-b Nanoscale materials and structures: fabrication and characterization

75.47.De Giant magnetoresistance

68.65.Ac Multilayers

82.80.Ej X-ray, Mössbauer, and other gamma-ray spectroscopic analysis methods

81.16.-c Methods of nanofabrication and processing

75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Chemical physics and physical chemistry

Dates

Issue 48 (5 December 2007)

Received 7 August 2007, in final form 4 October 2007

Published 30 October 2007



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