Electrodeposition of flow-induced composition modulated NiFe alloys in the uniform injection cell

✍ Scribed by J.Antonio Medina; Daniel T. Schwartz

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 557 KB
• Volume: 42
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/s0013-4686(97)00006-6

✦ Synopsis

NiFe thin film alloys with nanometer-scale spatially periodic composition modulations have been electrodeposited in the uniform injection cell (UIC) by oscillating the electrolyte flow rate. [See, Medina and Schwartz, J. Electrochem. Sot. 142, 451, 457, L46 (1995) for a description of the UIC.] The flow-induced composition modulated alloys were made using flow oscillation frequencies w I 0.05 Hz and galvanostatic deposition at -10 mA cm-2. Flow-induced periodicity wavelengths (A) as small as 55 nm were measured using stripping voltammetry. The experimental results showed that A had the expected inverse dependence on the flow oscillation frequency. The electrochemical response of the NiFe plating system was found to be out of phase with the low frequency (quasi-steady) flow modulations, a result that reiterates the anomalous nature of NiFe codeposition and the important role that careful hydrodynamic impedance studies could possibly play in analyzing the system.