Combinatorial electrodeposition of magnetostrictive Fe1-x Gax

Patrick D. McGary, K. Sai Madhukar Reddy, Greg D. Haugstad, Bethanie J H Stadler

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Alloys of iron and gallium were electroplated to produce magnetostrictive Galfenol Fe1-x Gax (10<x<40 atom %) thin films. A trapezoidal Hull cell was used to control composition via a combinatorial approach where the deposition current density was varied predictably across the cathode. Four parameter spaces were identified in which metallic iron, Galfenol, oxide, and Ga-rich metal films, respectively, were produced. It was found that a broad range of current densities could be used to produce Galfenol by varying the concentration of Ga3+ and its complexing agent, sodium citrate, compared to that of Fe2+. A novel method employing energy dispersive X-ray spectroscopy (EDS) was used to determine thickness as well as composition at specific points along the cathode. Deposition rates, partial current densities, and deposition efficiencies were determined accurately as a function of current density using the Nohse equation. The EDS results were verified with Rutherford backscattering (RBS). As expected, deposition rates increased with current density, while efficiencies of codeposition decreased. The grain sizes and crystallographic orientations of metallic Galfenol were dependent on deposition rate with fast rates producing small grains of (110) texturing and slow rates primarily producing large (211) oriented cubic crystals.

Original languageEnglish (US)
Pages (from-to)D656-D665
JournalJournal of the Electrochemical Society
Volume157
Issue number12
DOIs
StatePublished - Nov 24 2010

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