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dc.contributor.author
Aguirre, María del Carmen
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dc.contributor.author
Urreta, Silvia Elena
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dc.date.available
2023-01-20T09:54:13Z
dc.date.issued
2021-10-15
dc.identifier.citation
Aguirre, María del Carmen; Urreta, Silvia Elena; Effect of an external magnetic field orthogonal to the electrode surface on the electrocrystallization mechanism of Co-Fe films under pulsed applied potential; Elsevier Science SA; Journal of Alloys and Compounds; 878; 15-10-2021; 1-14
dc.identifier.issn
0925-8388
dc.identifier.uri
http://hdl.handle.net/11336/185075
dc.description.abstract
Co100−xFex (x = 0; 50; 30; 20) films are prepared by pulse-reverse plating onto Cu foils, in the presence of a magnetic field of 100 mT applied orthogonally to the substrate surface (B100) and in the condition B ~ 0 (B0). Energy-dispersive X-ray spectroscopy studies indicate that the Fe/Co ratios in the films are similar to those in the feed solution. The electrochemical nucleation and growth of Co and Co-Fe films are analyzed for individual, consecutive cathodic pulses, and also considering them as a continuous transient to achieve a steady stationary state. Current-time transient are analyzed applying the generalized Scharifker-Mostany model, assuming that parameters take effective values, describing the non-single-ion diffusion involved. All Co and Co-Fe films exhibit a 3D nucleation regime and diffusion-controlled growth. Films of pure cobalt prepared at B0 exhibit progressive nucleation (3DP) while bimetallic ones an instantaneous regime (3DI) predominates. Current-time transients obtained at B100 undergo changes from 3DI nucleation, for pure Co, turning more progressive 3DP regime for bimetallic, as the iron content increases. Film morphology and microstructure largely depend on Fe/Co composition and the applied magnetic field. For low iron content, films are granular and change to dendritic-like when iron content increases. Besides, for Co70Fe30 and Co50Fe50 compositions, nanowall-like structures at the surface change into whisker-like prisms when the magnetic field is applied. Iron containing films are thinner when deposited at B100 for all compositions. The key factors explaining the influence of the magnetic field and composition on the film deposition mechanisms and microstructure are: micro-magneto-hydrodynamic convection nearby the interface, the H2 desorption and the competence/interplay of Co(II) and Fe(II) ions during the alloy nucleation and growth.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science SA
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ELECTRODEPOSITION MECHANISMS
dc.subject
FE-CO FILMS
dc.subject
NANOSTRUCTURES
dc.subject
PULSED DEPOSITION UNDER MAGNETIC FLUX
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Effect of an external magnetic field orthogonal to the electrode surface on the electrocrystallization mechanism of Co-Fe films under pulsed applied potential
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-09-22T10:35:21Z
dc.identifier.eissn
1873-4669
dc.journal.volume
878
dc.journal.pagination
1-14
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Aguirre, María del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. Instituto de Física Enrique Gaviola; Argentina
dc.description.fil
Fil: Urreta, Silvia Elena. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física; Argentina
dc.journal.title
Journal of Alloys and Compounds
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0925838821017564?via%3Dihub
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1016/j.jallcom.2021.160347
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