Examinando por Autor "Vivas, Laura G."

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Magnetic interactions in ordered cobalt three-dimensional nanonetworks
(EMS, 2023-08-27) Ruiz Clavijo, Alejandra; Caballero Calero, Olga; Navas, David; Vivas, Laura G.; Martín Rubio, C.; Sanz, Ruy; Martín González, Marisol; Agencia Estatal de Investigación (AEI)
"Three-Dimensional (3D) magnetic nanostructures allow the generation and control of new effects able to give rise to the next generation of functional magnetic nanostructured metamaterials and devices[1]. This work reports the results on the synthesis and characterization of different interconnected Co nanowires forming a dense and ordered magnetic system: Co 3D Nanowire Networks (3DNN). These nanostructures were synthesized by the electrodeposition of Co in 3D ordered porous alumina templates [2] [3] [4]. The route allows to control the order and some geometric features compared to other synthesis approaches [1]. The resulting 3DNN consists of hexagonal ordered nanowires with an inter-wire distance of 65 nm and 50 nm in diameter. These nanowires are interconnected with a net of perpendicular or transversal nanowires (TNW) of ≈ 30 nm in diameter. Meanwhile the TNW are distributed in levels with a well defined distance between them of 550 nm. The magnetic characterization consisted in hysteresis loops, first magnetization curves and first order reversal curves (FORC) at 0º (in-plane, IP) 30º, 60º and 90º (out of plane, OOP) from perpendicular NW main axis. 1.D. Bhattacharya, et al. Nano Lett. (2022), 22, 24, 10010–10017. 2.J. Martín, et. al., Nat. Commun. 5, (2014) 5130. 3.A. Ruiz-Clavijo, et al. Phys. Status Solidi RRL, 13 (2019), 1900263. 4.A. Ruiz-Clavijo, et al., Adv. Electron. Mater. 8, (2022) 2200342"
Restringido
Nanostructured metamaterials for the thermal and electromagnetic isolation of cryostats
(SPIE, 2024-08-26) Vivas, Laura G.; Ramos Somolinos, D.; Martín Rubio, C.; Rivelles García, Alejandro; Madueño Custodio, Laura; Ruiz Clavijo, Alejandra; Díaz, Alberto; Schneider, Marc; Plaza Gallardo, Borja; Poyatos Martínez, David; Del Hoyo, J. C.; Caballero Calero, Olga; Worgull, M.; Martín Iglesias, Santiago; Martín Vodopivec, B.; Maicas, M.; Navas, David; Martín González, Marisol; Sanz, Ruy
In terms of thermal and electromagnetic isolation properties, Nanostructured Metamaterials may present important advantages compared to current employed materials. In this work, we present the synthesis routes and the preliminary characterization results of some metamaterials based on Poly-ether-ether-ketone and nanostructured anodic oxides, with low thermal conductivity, combined with Au nanocolumns and three-dimensional nanonetworks. The results reveals proper magnetic and electromagnetic properties and suggest their suitable use under vacuum and cryogenic conditions.