Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets

150 p.

Detalles Bibliográficos
Autor: Dolan, Eoin
Tipo de recurso: tesis doctoral
Fecha de publicación:2025
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/77431
Acceso en línea:http://hdl.handle.net/10810/77431
Access Level:acceso abierto
Palabra clave:metalografía
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spelling Tunable Spin-Charge Interconversion in 2D Materials and FerromagnetsDolan, Eoinmetalografía150 p.The impending end of Moore's law and the increasing energy consumption of computing motivate the search for new paradigms in computer architecture. Spintronics offers one such promising path, providing the potential for non-volatile storage techniques and a next generation of logic devices. A key enabling mechanism for these technologies is the efficient and controllable interconversion of charge and spin currents (spin-charge interconversion, SCI); which is achieved via mechanisms such as the spin Hall effect (SHE) or the Rashba-Edelstein effect (REE), which require spin-orbit coupling (SOC). This thesis presents an experimental investigation, supported by numerical simulations, into control mechanisms for SCI in two distinct platforms: in graphene via the application of a gate voltage, and in ferromagnetic (FM) materials via control of the magnetization vector relative to the spin current polarization.Graphene is an excellent candidate for spintronics due to its remarkably long spin diffusion length (¿s), although it has negligible intrinsic SOC. Fortunately, SOC, and thus, SCI can be induced in graphene devices by bringing it into close proximity with another material. In graphene proximitized with the two-dimensional material ReS2, we successfully induce SCI through two distinct mechanisms, each with a different symmetry. The presence of two distinct, gate tunable, SCI mechanisms offers possibilities for the construction of novel logic gates.While proximitisation with ReS2 is effective, the fabrication technique is not easily scalable. We therefore turned to a more industry-friendly approach using sputtered heavy metals. We demonstrate that this method induces a gate-tunable SCI in graphene, and via Finite Element Method (3D FEM) analysis, we show that ¿s remains largely unaffected, which is highly desirable for practical applications.Finally, we investigate the SHE in FM metals. We show that the spin Hall angle (¿SHE) in these materials varies dramatically depending on the relative orientation of the spin polarisation and the material's magnetization. However, this large anisotropy is almost entirely compensated by an opposing anisotropy in ¿s. As a result, ¿SHE׿s remains constant.Taken together, these results constitute important steps in the fundamental understanding and practical application of spin transport and SCI in both graphene-based systems and FM metalsCasanova Fernández, FélixHueso Arroyo, Luis Eduardo2026202620252025info:eu-repo/semantics/doctoralThesisapplication/pdfhttp://hdl.handle.net/10810/77431reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/3.0/es/Atribución 3.0 España(cc) 2025 Eoin Dolan (cc by 4.0)oai:addi.ehu.eus:10810/774312026-06-18T09:23:17Z
dc.title.none.fl_str_mv Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
title Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
spellingShingle Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
Dolan, Eoin
metalografía
title_short Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
title_full Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
title_fullStr Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
title_full_unstemmed Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
title_sort Tunable Spin-Charge Interconversion in 2D Materials and Ferromagnets
dc.creator.none.fl_str_mv Dolan, Eoin
author Dolan, Eoin
author_facet Dolan, Eoin
author_role author
dc.contributor.none.fl_str_mv Casanova Fernández, Félix
Hueso Arroyo, Luis Eduardo
dc.subject.none.fl_str_mv metalografía
topic metalografía
description 150 p.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/77431
url http://hdl.handle.net/10810/77431
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/3.0/es/
Atribución 3.0 España
(cc) 2025 Eoin Dolan (cc by 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/3.0/es/
Atribución 3.0 España
(cc) 2025 Eoin Dolan (cc by 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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