Person:
Guedeja-Marrón Gil, Alejandra

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First Name
Alejandra
Last Name
Guedeja-Marrón Gil
URI
https://hdl.handle.net/20.500.14352/85713
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física de Materiales
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2021 - 20223
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Now showing 1 - 3 of 3
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    Scaling up the production of electrodeposited nanowires: a roadmap towards applications
    (Nanomaterials, 2021) Fernández González, Claudia; Guzmán Mínguez, Jesús C.; Guedeja-Marrón Gil, Alejandra; García Martín, Eduardo; Foerster, Michael; Niño, Miguel Ángel; Aballe, Lucía; Quesada, Adrian; Pérez García, Lucas; Ruiz Gómez, Sandra
    The use of metallic nanowires is mostly reduced to scientific areas where a small quantity of nanostructures are needed. In order to broaden the applicability of these nanomaterials, it is necessary to establish novel synthesis protocols that provide a larger amount of nanowires than the conventional laboratory fabrication processes at a more competitive cost. In this work, we propose several modifications to the conventional electrochemical synthesis of nanowires in order to increase the production with considerably reduced production time and cost. To that end, we use a soft anodization procedure of recycled aluminum at room temperature to produce the alumina templates, followed by galvanostatic growth of CoFe nanowires. We studied their morphology, composition and magnetic configuration, and found that their properties are very similar to those obtained by conventional methods.
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    Electrodeposited magnetic nanowires with radial modulation of composition
    (Nanomaterials, 2022) Fernández González, Claudia; Guedeja-Marrón Gil, Alejandra; Rodilla González, Beatriz Loreto; Arché Nuñez, Ana; Corcuera, Rubén; Lucas, Irene; González, María Teresa; Varela Del Arco, María; Aballe, Lucía; Pérez García, Lucas; Presa Muñoz De Toro, Patricia Marcela De La; Ruiz Gómez, Sandra
    In the last few years, magnetic nanowires have gained attention due to their potential implementation as building blocks in spintronics applications and, in particular, in domain-wall- based devices. In these devices, the control of the magnetic properties is a must. Cylindrical magnetic nanowires can be synthesized rather easily by electrodeposition and the control of their magnetic properties can be achieved by modulating the composition of the nanowire along the axial direction. In this work, we report the possibility of introducing changes in the composition along the radial direction, increasing the degrees of freedom to harness the magnetization. In particular, we report the synthesis, using template-assisted deposition, of FeNi (or Co) magnetic nanowires, coated with a Au/Co (Au/FeNi) bilayer. The diameter of the nanowire as well as the thickness of both layers can be tuned at will. In addition to a detailed structural characterization, we report a preliminary study on the magnetic properties, establishing the role of each layer in the global collective behavior of the system.
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    Engineering the spin conversion in graphene monolayer epitaxial structures
    (APL materials, 2021) Anadón, Alberto; Gudín, Adrián; Guerrero, Rubén; Arnay, Icíar; Guedeja-Marrón Gil, Alejandra; Jiménez Cavero, Pilar; Díez Toledano, José Manuel; Ajejas, Fernando; Varela Del Arco, María; Petit Watelot, Sebastien; Lucas, Irene; Morellón, Luis; Algarabel, Pedro Antonio; Ibarra, Manuel Ricardo; Miranda, Rodolfo
    Spin Hall and Rashba-Edelstein effects, which are spin-to-charge conversion phenomena due to spin-orbit coupling (SOC), are attracting increasing interest as pathways to manage rapidly and at low consumption cost the storage and processing of a large amount of data in spintronic devices as well as more efficient energy harvesting by spin-caloritronics devices. Materials with large SOC, such as heavy metals (HMs), are traditionally employed to get large spin-to-charge conversion. More recently, the use of graphene (gr) in proximity with large SOC layers has been proposed as an efficient and tunable spin transport channel. Here, we explore the role of a graphene monolayer between Co and a HM and its interfacial spin transport properties by means of thermo-spin measurements. The gr/HM (Pt and Ta) stacks have been prepared on epitaxial Ir(111)/Co(111) structures grown on sapphire crystals, in which the spin detector (i.e., top HM) and the spin injector (i.e., Co) are all grown in situ under controlled conditions and present clean and sharp interfaces. We find that a gr monolayer retains the spin current injected into the HM from the bottom Co layer. This has been observed by detecting a net reduction in the sum of the spin Seebeck and interfacial contributions due to the presence of gr and independent from the spin Hall angle sign of the HM used.