Magnetic properties of CoPt thin films obtained by electrodeposition from hexachloroplatinate solution. Composition, thickness and substrate dependence

In this paper, magnetic properties of CoPt thin films electrodeposited from an aqueous hexachloroplatinate solution at pH 5.5, in presence of saccharin as an additive, are reported. The electrodeposition was carried out on a sputtered Ru-substrate at controlled potential. X-ray diffraction measureme...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-09, Vol.718, p.319-325
Main Authors: Dragos-Pinzaru, Oana, Ghemes, Adrian, Chiriac, Horia, Lupu, Nicoleta, Grigoras, Marian, Riemer, Steve, Tabakovic, Ibro
Format: Article
Language:English
Subjects:
Chemical composition
Chemical compounds
Close packed lattices
Cobalt base alloys
Cobalt compounds
CoPt thin film
Diffraction
Electrodeposition
Hard magnetic material
Intermetallic compounds
Magnetic domains
Magnetic properties
Magnetism
Platinum compounds
Roughening
Thin films
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Summary:In this paper, magnetic properties of CoPt thin films electrodeposited from an aqueous hexachloroplatinate solution at pH 5.5, in presence of saccharin as an additive, are reported. The electrodeposition was carried out on a sputtered Ru-substrate at controlled potential. X-ray diffraction measurements revealed that CoPt thin films prepared in these specific conditions crystallize in the hexagonal close packing (hcp) phase. The variations of the magnetic properties of 15–500 nm CoPt thin films are explained by taking into account the changes in the elemental composition, thickness, dynamics of the surface roughening during the early stages of deposition, and under-layer structure of the Ru-substrate. The structure and the width of the magnetic domains of electrodeposited CoPt thin films were examined by MFM and found to be thickness dependent. •CoPt thin film synthesis from hexachloroplatinate solution with saccharine, pH 5.5.•This thin films are almost ideal to be applied for bit-patterned media (BPM).•Crystal structure of films is hcp with a preferential growth along the (002) axis.•A thickness dependence of OOP Hc, Mr/Ms and Ms was observed and explained.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.05.186