Nucleation and growth mechanism of Co–Pt alloy nanowires electrodeposited within alumina template
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Co–Pt alloy nanowires were electrodeposited by direct current electrodeposition within nanoporous alumina templates with varying deposition potentials. The effect of deposition potential on nucleation and growth mechanisms during electrodeposition of Co–Pt alloy nanowires was investigated. The less negative deposition potential (−0.9 V) favours the instantaneous nucleation mechanism. The positive deviation from theoretical instantaneous and progressive nucleation mechanisms occurs at higher negative deposition potentials. The hysteresis behaviour and magnetic properties of electrodeposited Co–Pt alloy nanowires altered with varying deposition potential. The easy magnetization direction was in direction perpendicular to the wire axis. The deposition potential dependent change in hysteresis behaviour with increased coercivity and scattered remanence ratio was observed. This is attributed to better crystallinity with reduced defect density and hydrogen evolution causing structural changes at more negative deposition potentials.
KeywordsMagnetic nanowires Electrodeposition Alumina template Nucleation and growth mechanism
Ajeet K. Srivastav acknowledges financial support by the DAAD. He is grateful to Prof. L. Schultz to accept him as a DAAD fellow to perform the experiments at IFW Dresden under DAAD/IIT Master-Sandwich-Program. We would like to thank S. Neitsch for the preparation of alumina template. Finally, the authors are thankful to S. Fähler, H. Schlörb and M.S. Chandrasekar for fruitful discussion.