Structure, Microstructure, and Magnetism of Electrodeposited Fe70Pd30 Nanowires

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• 作者：Veronika Haehnel ; Christine Mickel ; Sebastian Fhler ; Ludwig Schultz ; Heike Schlrb
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：November 18, 2010
• 年：2010
• 卷：114
• 期：45
• 页码：19278-19283
• 全文大小：288K
• 年卷期：v.114,no.45(November 18, 2010)
• ISSN：1932-7455

文摘

Fe−Pd nanowires for MSM applications are obtained by electrodeposition from a stable complexed Fe³⁺/Pd²⁺ electrolyte. By application of an alternating potential mode, a composition close to the intended Fe₇₀Pd₃₀ alloy can be achieved. In particular, the second pulse step potential E₂ is identified to be the key parameter for continuous, defect-free nanowires. The adjustment of E₂ to more positive values avoids the formation of Pd-rich segments as well as the blocking of pores by hydrogen bubbles. Detailed TEM and structural investigations reveal a bcc Fe−Pd structure and nanocrystalline deposits with grain sizes in the 5 nm range. The observed structural features are attributed to the electrochemical processes within the constraint geometry of the nanoporous template. The magnetic properties of these nanowires are controlled by shape anisotropy as well as magnetostatic interactions.