Electrochemistry for L10 alloys (FeNi, FePt, CoPt)
Alloys of iron (Fe) and nickel (Ni) which have a special arrangement of the atoms (the L10 structure) have excellent magnetic properties, which are competitive with those of the rare earth magnets.Thus L10 FeNi is promising for the development of a next-generation permanent magnet, with no content of critical raw elements. L10-FeNi has only been found in some meteorites until now. Cyclic electrochemical oxidation and reduction may be an original route toward the formation of L10-FeNi.
Together with European Partners, we work in the M-ERA.NET COSMAG project to work out how to produce it on earth, in a short time-scale. Our research at TU Chemnitz aims to increase the atomic mobility of Fe and Ni using non-equilibrium methods such as cyclic electrochemical oxidation and reduction to form L10-FeNi.
For this, we rely on our experience on the electrochemical deposition and manipulation of L10 FePt and CoPt films:
- Electric-field control of magnetism by reversible surface reduction and oxidation reactions, Phys. Rev. B. 87, 224411, 2013. doi.org/10.1103/PhysRevB.87.224411.
- Electrode processes and in situ magnetic measurements of FePt films in a LiPF6 based electrolyte. Electrochim. Acta 81, 330, 2012. doi.org/10.1016/j.electacta.2012.07.055.
- Electrodeposition and hard magnetic properties of Co–Pt films in comparison to Fe–Pt films, J. Magn. Magn. Mater. 314, 116, 2007. doi.org/10.1016/j.jmmm.2007.02.146
- Highly coercive electrodeposited FePt films by postannealing in hydrogen, APL 85, 3498, 2004. doi.org/10.1063/1.1807958
