Determining the Proximity Effect-Induced Magnetic Moment in Graphene by Polarized Neutron Reflectivity and X-ray Magnetic Circular Dichroism

Autor:	Razan O. M. Aboljadayel, Christy J. Kinane, Carlos A. F. Vaz, David M. Love, Robert S. Weatherup, Philipp Braeuninger-Weimer, Marie-Blandine Martin, Adrian Ionescu, Andrew J. Caruana, Timothy R. Charlton, Justin Llandro, Pedro M. S. Monteiro, Crispin H. W. Barnes, Stephan Hofmann, Sean Langridge
Přispěvatelé:	Aboljadayel, Razan OM [0000-0002-4512-9858], Kinane, Christy J [0000-0002-1185-0719], Vaz, Carlos AF [0000-0002-6209-8918], Weatherup, Robert S [0000-0002-3993-9045], Braeuninger-Weimer, Philipp [0000-0001-8677-1647], Caruana, Andrew J [0000-0003-0715-5876], Charlton, Timothy R [0000-0002-5443-8492], Llandro, Justin [0000-0002-1362-6083], Hofmann, Stephan [0000-0001-6375-1459], Apollo - University of Cambridge Repository
Rok vydání:	2023
Předmět:	Condensed Matter::Materials Science Condensed Matter - Mesoscale and Nanoscale Physics XMCD magnetism graphene Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Physics::Atomic and Molecular Clusters FOS: Physical sciences Physics::Optics General Materials Science heterostructure PNR
Zdroj:	ACS Applied Materials & Interfaces. 15:22367-22376
ISSN:	1944-8252 1944-8244
DOI:	10.1021/acsami.2c02840
Popis:	We report the magnitude of the induced magnetic moment in CVD-grown epitaxial and rotated-domain graphene in proximity with a ferromagnetic Ni film, using polarized neutron reflectivity (PNR) and X-ray magnetic circular dichroism (XMCD). The XMCD spectra at the C K-edge confirms the presence of a magnetic signal in the graphene layer and the sum rules give a magnetic moment of up to $\sim\,0.47\,\mu$_B/C atom induced in the graphene layer. For a more precise estimation, we conducted PNR measurements. The PNR results indicate an induced magnetic moment of $\sim$ 0.53 $\mu$_B/C atom at 10 K for rotated graphene and $\sim$ 0.38 $\mu$_B/C atom at 10 K for epitaxial graphene. Additional PNR measurements on graphene grown on a non-magnetic Ni_9Mo_1 substrate, where no magnetic moment in graphene is measured, suggest that the origin of the induced magnetic moment is due to the opening of the graphene's Dirac cone as a result of the strong C pz-3d hybridization. Comment: 21 pages, 7 figures
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2dd7e2ce4cef15fd451c03f6c7d4f43e https://doi.org/10.1021/acsami.2c02840 Zobrazit plný text záznamu