Electrodeposited Magnetic Nanowires with Radial Modulation of Composition

Fernández-González, Claudia; Guedeja-Marrón, Alejandra; Rodilla, Beatriz L.; Arché‐Núñez, Ana; Corcuera, Rubén; Lucas, I.; González, M. Teresa; Varela, María; Presa, Patricia de la; Aballe, Lucía; Pérez, Lucas; Ruiz-Gómez, Sandra

doi:10.3390/nano12152565

Cited by 6 publications

(5 citation statements)

References 43 publications

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“…Magnetocrystalline or magnetoelastic anisotropies could be introduced, thereby adding a third magnetic energy to the competition [52]. Furthermore, we could consider variations of composition and geometry along the length of the wire [24,25,[56][57][58][59][60][61][62]. The understanding how different degrees of magnetic coupling may affect magnetic states in nanostructures is important for many sub-areas of nanomagnetism, from biomagnetism to spintronics, and will assist in the understanding and design of coupled 3D nanostructures.…”

Section: Discussionmentioning

confidence: 99%

Controlled evolution of three-dimensional magnetic states in strongly coupled cylindrical nanowire pairs

et al. 2023

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Cylindrical magnetic nanowires are promising systems for the development of three-dimensional spintronic devices. Here, we simulate the evolution of magnetic states during fabrication of strongly-coupled cylindrical nanowires with varying degrees of overlap. By varying the separation between wires, the relative strength of exchange and magnetostatic coupling can be tuned. Hence, we observe the formation of six fundamental states as a function of both inter-wire separation and wire height. In particular, two complex three-dimensional magnetic states, a 3D Landau Pattern and a Helical domain wall, are observed to emerge for intermediate overlap. These two emergent states show complex spin configurations, including a modulated domain wall with both Néel and Bloch character. The competition of magnetic interactions and the parallel growth scheme we follow (growing both wires at the same time) favours the formation of these anti-parallel metastable states. This works shows how the engineering of strongly coupled 3D nanostructures with competing interactions can be used to create complex spin textures.

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Section: Discussionmentioning

confidence: 99%

Controlled evolution of three-dimensional magnetic states in strongly coupled cylindrical nanowire pairs

et al. 2023

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“…Nanostructured electrodes were prepared by template-assisted electrochemical deposition similarly as previously described 39 , 51 . We used polycarbonate nanoporous membranes as templates, with 100 nm pore diameter.…”

Section: Methodsmentioning

confidence: 99%

“…In this context, we recently developed a novel approach 39 to create metallic core–shell NWs based on a two-step template-assisted electrodeposition process. Template-assisted electrochemical deposition is one of the most efficient techniques to grow 1D metallic nanostructures, which can be converted into core–shell nanostructures using different approaches 35 , 40 – 43 .…”

Section: Introductionmentioning

confidence: 99%

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Flexible metallic core–shell nanostructured electrodes for neural interfacing

Rodilla,

Arché-Núñez,

Ruiz-Gómez

et al. 2024

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Electrodes with nanostructured surface have emerged as promising low-impedance neural interfaces that can avoid the charge‐injection restrictions typically associated to microelectrodes. In this work, we propose a novel approximation, based on a two-step template assisted electrodeposition technique, to obtain flexible nanostructured electrodes coated with core–shell Ni–Au vertical nanowires. These nanowires benefit from biocompatibility of the Au shell exposed to the environment and the mechanical properties of Ni that allow for nanowires longer and more homogeneous in length than their only-Au counterparts. The nanostructured electrodes show impedance values, measured by electrochemical impedance spectroscopy (EIS), at least 9 times lower than those of flat reference electrodes. This ratio is in good accordance with the increased effective surface area determined both from SEM images and cyclic voltammetry measurements, evidencing that only Au is exposed to the medium. The observed EIS profile evolution of Ni–Au electrodes over 7 days were very close to those of Au electrodes and differently from Ni ones. Finally, the morphology, viability and neuronal differentiation of rat embryonic cortical cells cultured on Ni–Au NW electrodes were found to be similar to those on control (glass) substrates and Au NW electrodes, accompanied by a lower glial cell differentiation. This positive in-vitro neural cell behavior encourages further investigation to explore the tissue responses that the implantation of these nanostructured electrodes might elicit in healthy (damaged) neural tissues in vivo, with special emphasis on eventual tissue encapsulation.

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“…The NWs of magnetic materials like nickel, iron, and cobalt have been widely studied because of their incredible applications in the field of electronics, sensors, high-density media storage devices and drug delivery system [ 12 , 13 , 14 , 15 , 16 , 17 ]. Among the ferromagnetic nanostructures, nickel (Ni) has become the prominent candidate for soft sensor applications due to less oxidation problems as compared to their ferromagnetic counterparts.…”

Section: Introductionmentioning

confidence: 99%