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Preparation of cobalt nanowires in porous aluminum oxide: Study of the effect of barrier layer

Published online by Cambridge University Press:  03 July 2012

Mojgan Najafi ,
Saeid Soltanian ,
Habibollah Danyali ,
Rahman Hallaj ,
Abdollah Salimi ,
Seyed Mohammad Elahi  and
Peyman Servati
Mojgan Najafi
Affiliation:
Department of Physics, University of Kurdistan, Sanandaj, 66177-15175 Iran; and Department of Material Engineering, Hamedan University of Technology, Hamedan, 65169-13418 Iran
Saeid Soltanian*
Affiliation:
Department of Physics, University of Kurdistan, Sanandaj, 66177-15175 Iran
Habibollah Danyali
Affiliation:
Department of Electrical Engineering, University of Kurdistan, Sanandaj, 66177-15175 Iran
Rahman Hallaj
Affiliation:
Department of Chemistry, University of Kurdistan, Sanandaj, 66177-15175 Iran
Abdollah Salimi
Affiliation:
Department of Chemistry, University of Kurdistan, Sanandaj, 66177-15175 Iran
Seyed Mohammad Elahi
Affiliation:
Department of Physics, Science and Research Branch, Islamic Azad University, Tehran 775-14515, Iran
Peyman Servati
Affiliation:
Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, V6T1Z4 Canada
*
a)Address all correspondence to this author. e-mail: saeid@ece.ubc.ca; s.soltanian@gmail.com
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Abstract

High-density cobalt (Co) nanowires (NWs) were fabricated using porous anodized aluminum oxide as a template. Measurement results show a high magnetic performance for NWs with a coercivity of about 1750 Oe and strong magnetic anisotropy with an easy axis parallel to the NW direction. We have investigated the effect of alternating current (AC) electrodeposition frequency on the magnetic properties of NW samples. We show that understanding the effect of barrier layer is critical for controlling the rate of NW electrodeposition. A circuit model is proposed that accurately describes the role of the barrier and interfacial layers during deposition. Results obtained by simulation of the circuit show an excellent agreement with experimental results for different frequencies and voltages. It is shown that the amount of electrodeposited material can be estimated based on the difference between the anodic and cathodic half cycles in the electrodeposited current. Use of higher frequency leads to more symmetrical half cycles and smaller electrodeposited material.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 18 , 28 September 2012 , pp. 2382 - 2390
Copyright
Copyright © Materials Research Society 2012

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References

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