FePt magnetic multilayers electrodeposited from non-aqueous liquids

Abstract

FePt magnetic multilayers were pulse electrodeposited from the mixture of ammonium hexachloroplatinate and iron dichloride in ionic liquids based on glycol (EG) and 1-ethyl-3-methylimidazolium chloride (EMIC). The chelate effect and electrochemical behaviour of the EMIC with the ions were determined by ultraviolet-visible spectra and cyclic voltammetry respectively. The iron atomic content in the FePt films ranged from 0?4 to 81?0 at-% when deposition potentials changed from 1?0 to 22?0 V(Ag/AgCl) in electrodeposition system with the EG (50 mL), ammonium hexachloroplatinate (25 mM L 21 ), iron dichloride (175 mM L 21 ) and EMIC (25 mM L 21 ) at 393 K. Fe 50 Pt 50 thin films with smooth surface (50 at-% iron layer in FePt film) and the multilayer cross-section were obtained. Fct structural FePt multilayer was obtained based on X-ray diffraction pattern. Magnetic hysteresis loops showed that the multilayer possessed a magnetic anisotropic behaviour.

Electrodeposition of multilayer Ni–W and Ni–W–alumina nanocomposite coatings

“…6 Adjusting and controlling the pulse parameters enables us to develop coatings of the new structure and characteristics, such as functionally graded [7][8][9][10][11] and layered structures. [12][13][14][15][16] Formerly, Co-Cu 17,18 and/or Ni-Cu 19,20 coatings with layered structure were developed using the pulse technique. In these coatings, Cu is thermodynamically nobler than either Co or Ni; therefore, it deposits at lower potentials (at which Co or Ni does not deposit).…”

“…6 Adjusting and controlling the pulse parameters enables us to develop coatings of the new structure and characteristics, such as functionally graded 7-11 and layered structures. 12-16…”

Nanoscale Metal/Metal Multilayers Electrodeposited from Ethaline

“…electrodeposited compositionally modulated Fe-Pt alloy films from an ionic liquid based on glycol and 1-ethyl-3-methylimidazolium chloride, but the layer thicknesses were in the μm-range. 16 Nevertheless, non-aqueous electrolytes are an attractive option for multilayers because they could extend the range of metals deposited to those that require potentials outside the electrochemical window of water. They could also deliver new opportunities to modify the microstructure of multilayers that have previously been deposited from aqueous electrolytes.…”