Parametric aqueous electrodeposition study and characterization of Fe–Cu films

Dislaki, Evangelia; Sort, Jordi; Pellicer, Eva

doi:10.1016/j.electacta.2017.02.092

Cited by 17 publications

(15 citation statements)

References 43 publications

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“…It should be noted that all the porous films present the same peaks corresponding to body‐centered cubic (bcc) Fe and are, therefore, single phase. Typically, phase separation into bcc and face‐centered cubic (fcc) phases can occur in this range of compositions for electrodeposited Fe–Cu films with a thickness of several micrometers . However, it was confirmed that this was not the case for continuous films of 250–300 nm thickness as in our case (only peaks from bcc Fe were observed, not shown).…”

Section: Resultssupporting

confidence: 51%

“…Additionally, it should be emphasized that a Cu enrichment of the Fe–Cu solid solution would have resulted in a reduction in saturation magnetization, and in eventual shifts in the XRD peaks, which is shown not to be the case. Finally, it was previously established that a higher Cu content in the electrodeposited Fe–Cu films actually causes an increase in H c rather than the reduction observed here for negative voltages . Therefore, the structural changes induced by the electric field observed in this system mainly influence the Cu species at the surface, whereas the Fe species controlling the magnetic behavior remain unaltered.…”

Section: Resultsmentioning

confidence: 47%

“…The samples were deposited from the as‐prepared solution with a pH of 4.1 at a temperature of 35 °C. The optimized electrolyte composition and plating conditions were established previously with unpatterned substrates . Current densities of –25 mA cm –2 and deposition times between 15 and 50 s depending on the diameter of the previously deposited spheres and the desired thickness were applied.…”

Section: Methodsmentioning

confidence: 99%

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Coercivity Modulation in Fe–Cu Pseudo‐Ordered Porous Thin Films Controlled by an Applied Voltage: A Sustainable, Energy‐Efficient Approach to Magnetoelectrically Driven Materials

et al. 2018

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Fe–Cu films with pseudo‐ordered, hierarchical porosity are prepared by a simple, two‐step procedure that combines colloidal templating (using sub‐micrometer‐sized polystyrene spheres) with electrodeposition. The porosity degree of these films, estimated by ellipsometry measurements, is as high as 65%. The resulting magnetic properties can be controlled at room temperature using an applied electric field generated through an electric double layer in an anhydrous electrolyte. This material shows a remarkable 25% voltage‐driven coercivity reduction upon application of negative voltages, with excellent reversibility when a positive voltage is applied, and a short recovery time. The pronounced reduction of coercivity is mainly ascribed to electrostatic charge accumulation at the surface of the porous alloy, which occurs over a large fraction of the electrodeposited material due to its high surface‐area‐to‐volume ratio. The emergence of a hierarchical porosity is found to be crucial because it promotes the infiltration of the electrolyte into the structure of the film. The observed effects make this material a promising candidate to boost energy efficiency in magnetoelectrically actuated devices.

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 47%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Coercivity Modulation in Fe–Cu Pseudo‐Ordered Porous Thin Films Controlled by an Applied Voltage: A Sustainable, Energy‐Efficient Approach to Magnetoelectrically Driven Materials

et al. 2018

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“…Typically, electrodeposition of metal alloys from aqueous solutions occurs along with abundant hydrogen evolution on the cathode. This leads to a local increase in pH at the electrode/solution interface and may cause the formation of insoluble hydroxides which become incorporated in the coating [28]. The precipitation of hydroxides at the electrode/solution interface with the layer growth is expected to have an impact on the physical and chemical properties of the obtained deposits [29].…”

Section: Introductionmentioning

confidence: 99%

In-depth characterization of as-deposited and annealed Fe-W coatings electrodeposited from glycolate-citrate plating bath

Mulone

Nicolenco

Hoffmann

et al. 2018

Electrochimica Acta

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FeW coatings with 4, 16 and 24 at.% of W were electrodeposited under galvanostatic conditions from a new environmental friendly Fe(III)-based glycolate-citrate bath. This work aims to find correlations between composition including the light elements, internal structure of the electrodeposited Fe-Walloys and functional properties of material. The obtained alloys were characterized by Glow Discharge Optical Emission Spectrometry (GD-OES), Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS), Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD). Compositional depth profiles of 10 mm thick coatings obtained by GD-OES show that the distribution of metals is uniform along the entire film thickness, while SEM imaging depicted the presence of cracks and O-and W-rich areas inside the Fe-Wcoating with 4 at.% W. In the samples with 16 and 24 at.% of W, oxygen and hydrogen are present mostly at the surface about 1 mm from the top while traces of carbon are distributed within the entire coatings. With increasing W content, the structure of the coatings changes from nanocrystalline to amorphous which was shown by XRD and TEM analysis. Also, the surface of coatings becomes smoother and brighter, that was explained based on the local adsorption of intermediates containing iron and tungsten species. Annealing experiments coupled with XRD analysis show that the thermal stability of FeW alloys increases when the W content increases, i.e. the coating with 24 at.% W retains the amorphous structure up to 600 _C, where a partially recrystallized structure was observed. Upon recrystallization of the amorphous samples the following crystalline phases are formed: a-Fe, Fe2W, Fe3W3C, Fe6W6C, and FeWO4. Hence, the FeW coatings with higher W content (>25 at.%) can be considered as suitable material for high temperature applications. Fig. 4. Compositional depth profiles as obtained by GD-OES of FeW samples of different composition: 4 at.% of W (a), 16 at.% of W (b) and 25 at.% of W(c).

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“…The formation of this metal hydride usually induces a lattice distortion followed by surface cracking [46]; however, SEM images reported in Figure 4 do not show this evidence. When deposition is performed for longer times (sample S500, cyan pattern in Figure 3), the fluctuation of the electrolyte composition in proximity of the working electrode becomes stronger, causing the deposition of a further phase identified as almost pure palladium [43].…”

Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Properties of FePd Thin Film Synthesized by Electrodeposition Method

et al. 2020

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Bimetallic nanomaterials in the form of thin film constituted by magnetic and noble elements show promising properties in different application fields such as catalysts and magnetic driven applications. In order to tailor the chemical and physical properties of these alloys to meet the applications requirements, it is of great importance scientific interest to study the interplay between properties and morphology, surface properties, microstructure, spatial confinement and magnetic features. In this manuscript, FePd thin films are prepared by electrodeposition which is a versatile and widely used technique. Compositional, morphological, surface and magnetic properties are described as a function of deposition time (i.e., film thickness). Chemical etching in hydrochloric acid was used to enhance the surface roughness and help decoupling crystalline grains with direct consequences on to the magnetic properties. X-ray diffraction, SEM/AFM images, contact angle and magnetic measurements have been carried out with the aim of providing a comprehensive characterisation of the fundamental properties of these bimetallic thin films.

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Parametric aqueous electrodeposition study and characterization of Fe–Cu films

Cited by 17 publications

References 43 publications

Coercivity Modulation in Fe–Cu Pseudo‐Ordered Porous Thin Films Controlled by an Applied Voltage: A Sustainable, Energy‐Efficient Approach to Magnetoelectrically Driven Materials

Coercivity Modulation in Fe–Cu Pseudo‐Ordered Porous Thin Films Controlled by an Applied Voltage: A Sustainable, Energy‐Efficient Approach to Magnetoelectrically Driven Materials

In-depth characterization of as-deposited and annealed Fe-W coatings electrodeposited from glycolate-citrate plating bath

Structural and Magnetic Properties of FePd Thin Film Synthesized by Electrodeposition Method

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