Critical phenomena in magnetic nanowires

Venkata Kamalakar, M. ; Rayachudhuri, A. K. (2009) Critical phenomena in magnetic nanowires Journal of Nanoscience and Nanotechnology, 9 (9). pp. 5248-5253. ISSN 1533-4880

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In this paper we report the first experimental study of critical phenomena in case of magnetic nanowires of nickel near the ferromagnetic-paramagnetic transition from the electrical transport properties. Nickel nanowire arrays, prepared by potentiostatic electrodeposition of nickel inside pores of nanoporous anodic alumina template were well characterized by X-ray Diffraction, Transmission electron microscopy and Energy dispersive Spectroscopy. Precise electrical resistance measurement of the nanowire arrays of wire diameter 20 nm have been done in the temperature range between 300 K to 700 K. We see a drop in the Curie temperature as observed from the resistivity anomaly. We analyzed the resistance data near the critical region and extracted the critical exponent a directly from the resistance. We observed a decrease in the critical part of the resistivity including a decrease in the magnitude of the critical exponent a and severe modification in the correction to scaling.

Item Type:Article
Source:Copyright of this article belongs to American Scientific Publishers.
Keywords:Magnet Nanowires; Critical Exponents; Critical Phenomena; Electrodeposition
ID Code:42591
Deposited On:04 Jun 2011 12:13
Last Modified:04 Jun 2011 12:13

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