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Nano Research 2008, 1(6): 465-473 https://doi.org/10.1007/s12274-008-8049-9
Research Article | Open Access | Issue | Published: 01 December 2008

On the Growth Mechanism of Nickel and Cobalt Nanowires and Comparison of Their Magnetic Properties

Show Author's Information T. N Narayanan1,  M. M Shaijumon2,  Lijie Ci2,  P. M Ajayan2( ),  M. R Anantharaman1( )
Department of Physics Cochin University of Science & Technology, Cochin-22Kerala India
Department of Mechanical Engineering & Materials Science Rice UniversityHoustonTX 77005 USA
Keywords:
electrodeposition, Magnetic nanowires, mobility assisted growth, magnetostatic interaction, magnetisation switching
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Narayanan TN, Shaijumon MM, Ci L, et al. On the Growth Mechanism of Nickel and Cobalt Nanowires and Comparison of Their Magnetic Properties. Nano Research, 2008, 1(6): 465-473. https://doi.org/10.1007/s12274-008-8049-9
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Abstract Full text About this article

Magnetic nanowires (NWs) are ideal materials for the fabrication of various multifunctional nanostructures which can be manipulated by an external magnetic field. Highly crystalline and textured nanowires of nickel (Ni NWs) and cobalt (Co NWs) with high aspect ratio (˜330) and high coercivity have been synthesized by electrodeposition using nickel sulphate hexahydrate (NiSO4·6H2O) and cobalt sulphate heptahydrate (CoSO4·7H2O) respectively on nanoporous alumina membranes. They exhibit a preferential growth along 〈110〉. A general mobility assisted growth mechanism for the formation of Ni and Co NWs is proposed. The role of the hydration layer on the resulting one-dimensional geometry in the case of potentiostatic electrodeposition is verified. A very high interwire interaction resulting from magnetostatic dipolar interactions between the nanowires is observed. An unusual low-temperature magnetisation switching for field parallel to the wire axis is evident from the peculiar high field M(T) curve.


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About this article

On the Growth Mechanism of Nickel and Cobalt Nanowires and Comparison of Their Magnetic Properties

Show Author's information T. N Narayanan1, M. M Shaijumon2, Lijie Ci2, P. M Ajayan2( ), M. R Anantharaman1( )
Department of Physics Cochin University of Science & Technology, Cochin-22Kerala India
Department of Mechanical Engineering & Materials Science Rice UniversityHoustonTX 77005 USA

Abstract

Magnetic nanowires (NWs) are ideal materials for the fabrication of various multifunctional nanostructures which can be manipulated by an external magnetic field. Highly crystalline and textured nanowires of nickel (Ni NWs) and cobalt (Co NWs) with high aspect ratio (˜330) and high coercivity have been synthesized by electrodeposition using nickel sulphate hexahydrate (NiSO4·6H2O) and cobalt sulphate heptahydrate (CoSO4·7H2O) respectively on nanoporous alumina membranes. They exhibit a preferential growth along 〈110〉. A general mobility assisted growth mechanism for the formation of Ni and Co NWs is proposed. The role of the hydration layer on the resulting one-dimensional geometry in the case of potentiostatic electrodeposition is verified. A very high interwire interaction resulting from magnetostatic dipolar interactions between the nanowires is observed. An unusual low-temperature magnetisation switching for field parallel to the wire axis is evident from the peculiar high field M(T) curve.

Keywords: electrodeposition, Magnetic nanowires, mobility assisted growth, magnetostatic interaction, magnetisation switching

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Publication history
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Publication history

Received: 22 August 2008
Revised: 11 October 2008
Accepted: 28 October 2008
Published: 01 December 2008
Issue date: December 2008

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© Tsinghua Press and Springer-Verlag 2008

Acknowledgements

Acknowledgements

T. N. Narayanan acknowledges the financial support received from the Interconnect Focus Center at Rensselaer Polytechnic Institute, Troy, New York, USA. T. N. Narayanan thanks Kerala State Council for Science, Technology and Environment (D.O. No. 004/FSHIP/05/KSCSTE), Kerala, India for financial support in the form of a fellowship. T. N. Narayanan and M. R. Anantharaman acknowledge Prof. Gunter Schatz, Prof. Manfred Albrecht, and Dr. Ildico Guhr, Department of Physics, University of Konstanz, Germany for SQUID measurements and fruitful discussions. M. R. Anantharaman thanks DST-DAAD PPP for awarding an exchange programme.

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