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Synthesis and magnetotransport studies of single nickel-rich NiFe nanowire

Y Rheem1,2, B-Y Yoo1,2, B K Koo3, W P Beyermann2,4 and N V Myung1,2,5

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One of the main concerns in the preparation of alloy nanowires is the ability to synthesize compositionally uniform nanowires along the axis. Since most of the conventional mild acidic permalloy (Ni80Fe20) electroplating baths consist of an extremely low concentration of Fe ions compared with Ni ions, the electrodeposition of iron is controlled by mass transfer, which leads to a significant change in the composition along the axis of the nanowire. To overcome this obstacle, we developed a new acidic chloride electrolyte with a high concentration of Fe and Ni ions to electrodeposit homogeneous nanowires. After synthesizing nanowires, the temperature dependent magneto- and electro-transport properties of individual nanowires were investigated. The temperature coefficient of resistance of a nanowire is much lower than the bulk counterpart, which might be attributed to a higher residual resistivity. The magnetoresistance shows a typical anisotropic magnetoresistance behaviour where the maximum anisotropic magnetoresistance ratio decreased with increasing temperature. The angular dependence of the magnetization switching field indicated that curling is the magnetization reversal mode at all temperatures.


PACS

81.16.-c Methods of nanofabrication and processing

73.63.-b Electronic transport in nanoscale materials and structures

75.75.+a Magnetic properties of nanostructures

75.60.Jk Magnetization reversal mechanisms

72.15.Gd Galvanomagnetic and other magnetotransport effects

81.15.Pq Electrodeposition, electroplating

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 23 (7 December 2007)

Received 7 September 2007, in final form 16 October 2007

Published 16 November 2007



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