Intercalated europium metal in epitaxial graphene on SiC

Anderson, Nathaniel; Hupalo, Myron; Keavney, David; Tringides, Michael C.; Vaknin, David

doi:10.1103/PhysRevMaterials.1.054005

Title: Intercalated europium metal in epitaxial graphene on SiC

Journal Article · Wed Oct 25 00:00:00 EDT 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.054005· OSTI ID:1415795

Anderson, Nathaniel ^[1]; Hupalo, Myron ^[1]; Keavney, David ^[2]; Tringides, Michael C. ^[1]; Vaknin, David ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division

X-ray magnetic circular dichroism (XMCD) reveals the magnetic properties of intercalated europium metal under graphene on SiC(0001). The intercalation of Eu nanoclusters (average size 2.5 nm) between graphene and SiC substate are formed by deposition of Eu on epitaxially grown graphene that is subsequently annealed at various temperatures while keeping the integrity of the graphene layer. Using sum-rules analysis of the XMCD of Eu M-4,M-5 edges at T = 15 K, our samples show paramagnetic-like behavior with distinct anomaly at T approximate to 90 K, which may be related to the Neel transition, T-N = 91 K, of bulk metal Eu. We find no evidence of ferromagnetism due to EuO or antiferromagnetism due to Eu2O3, indicating that the graphene layer protects the intercalated metallic Eu against oxidation over months of exposure to atmospheric environment.

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Research Organization:: Ames Lab., Ames, IA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358; AC02-06CH11357

OSTI ID:: 1415795

Alternate ID(s):: OSTI ID: 1404744; OSTI ID: 1461416

Report Number(s):: IS-J-9524; PRMHAR; TRN: US1800853

Journal Information:: Physical Review Materials, Vol. 1, Issue 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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2D ferromagnetism in europium/graphene bilayers Sokolov, Ivan S.; Averyanov, Dmitry V.; Parfenov, Oleg E. Materials Horizons, Vol. 7, Issue 5 https://doi.org/10.1039/c9mh01988j	journal	January 2020

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