Engineering the spin conversion in graphene monolayer epitaxial structures

Anadón, A. ; Gudín, A. ; Guerrero, R. ; Arnay, I. ; Guedeja-Marron, A. ; Jiménez-Cavero, P. ; Díez Toledano, J.M. ; Ajejas, F. ; Varela, M. ; Petit-Watelot, S. ; Lucas, I. (Universidad de Zaragoza) ; Morellón, L. (Universidad de Zaragoza) ; Algarabel, P.A. ; Ibarra, M.R. (Universidad de Zaragoza) ; Miranda, R. ; Camarero, J. ; Rojas-Sánchez, J.C. ; Perna, P.

Resumen: 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. © 2021 Author(s).

Idioma: Inglés

DOI: 10.1063/5.0048612

Año: 2021

Publicado en: APL Materials 9, 6 (2021), 061113 [7 pp]
ISSN: 2166-532X

Factor impacto JCR: 6.635 (2021)

Categ. JCR: PHYSICS, APPLIED rank: 33 / 161 = 0.205 (2021) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 43 / 108 = 0.398 (2021) - Q2 - T2
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 94 / 344 = 0.273 (2021) - Q2 - T1

Factor impacto CITESCORE: 8.6 - Materials Science (Q1) - Engineering (Q1)

Factor impacto SCIMAGO: 1.527 - Materials Science (miscellaneous) (Q1) - Engineering (miscellaneous) (Q1)

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)