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Title

Nanocrystalline Electroplated Cu–Ni: Metallic Thin Films with Enhanced Mechanical Properties and Tunable Magnetic Behavior

AuthorsPellicer, Eva; Varea, A.; Menéndez, E.; Estrader, Marta ; Nogués, Josep ; Sort, J.
KeywordsAlloys
Magnetic materials
Thin films
Functional coatings
Microelectromechanical systems
Issue DateMar-2010
PublisherWiley-VCH
CitationAdvanced Functional Materials 20(6): 983-991 (2010)
AbstractNanocrystalline 3 µm thick Cu1–xNix (0.45 ≤ x ≤ 0.87) films are electrodeposited galvanostatically onto Cu/Ti/Si (100) substrates, from a citrate- and sulphate-based bath containing sodium lauryl sulphate and saccharine as additives. The films exhibit large values of reduced Young's modulus (173 < Er < 192 GPa) and hardness (6.4 < H < 8.2 GPa), both of which can be tailored by varying the alloy composition. The outstanding mechanical properties of these metallic films can be ascribed to their nanocrystalline nature—as evidenced by X-ray diffraction, transmission electron microscopy, and atomic force microscopy—along with the occurrence of stacking faults and the concomitant formation of intragranular nanotwins during film growth. Due to their nanocrystalline character, these films also show very low surface roughness (root mean square deviation of around 2 nm). Furthermore, tunable magnetic properties, including a transition from paramagnetic to ferromagnetic behavior, are observed when the Ni percentage is increased. This combination of properties, together with the simplicity of the fabrication method, makes this system attractive for widespread technological applications, including hard metallic coatings or magnetic micro/nano-electromechanical devices.
Description9 páginas, 6 figuras, 1 tabla.-- et al.
Publisher version (URL)http://dx.doi.org/10.1002/adfm.200901732
URIhttp://hdl.handle.net/10261/48558
DOI10.1002/adfm.200901732
ISSN1616-301X
E-ISSN1616-3028
Appears in Collections:(CIN2) Artículos
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