Tuning the Graphene on Ir(111) adsorption regime by Fe/Ir surface-alloying

Brede, J. ; Slawinska, J. ; Abadia, M. ; Rogero, C. ; Ortega, J.E. ; Piquero-Zulaica, I. ; Lobo-Checa, J. (Universidad de Zaragoza) ; Arnau, A. ; Cerdá, J.I.

Resumen: A combined scanning tunneling microscopy, x-ray photoelectron spectroscopy, angle-resolved photoemission spectroscopy, and density functional theory study of graphene on a Fe-Ir(111) alloy with variable Ir concentration is presented. Starting from an intercalated Fe layer between the graphene and Ir(111) surface we find that graphene-substrate interaction can be fine-tuned by Fe-Ir alloying at the interface. When a critical Ir-concentration close to 0.25 is reached in the Fe layer, the Dirac cone of graphene is largely restored and can thereafter be tuned across the Fermi level by further increasing the Ir content. Indeed, our study reveals an abrupt transition between a chemisorbed phase at small Ir concentrations and a physisorbed phase above the critical concentration. The latter phase is highly reminiscent of the graphene on the clean Ir(111) surface. Furthermore, the transition is accompanied by an inversion of the graphene''s induced magnetization due to the coupling with the Fe atoms from antiferromagnetic when chemisorbed to weakly ferromagnetic in the physisorption regime, with spin polarizations whose magnitude may be tuned with the amount of Fe content.

Idioma: Inglés

DOI: 10.1088/2053-1583/4/1/015016

Año: 2017

Publicado en: 2D Materials 4, 1 (2017), 015016 [16pp.]
ISSN: 2053-1583

Factor impacto JCR: 7.042 (2017)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 33 / 285 = 0.116 (2017) - Q1 - T1

Factor impacto SCIMAGO: 2.813 - Chemistry (miscellaneous) (Q1) - Condensed Matter Physics (Q1) - Mechanics of Materials (Q1) - Mechanical Engineering (Q1) - Materials Science (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2013-48286-C2-1-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46593-C6-4-P
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-47878-C2-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-66888-C3-1R

Tipo y forma: Artículo (Versión definitiva)

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