Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 474, Issue -, Pages 666-670Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2018.11.007
Keywords
Rare earths; Eu; Dy; Gd; Intercalation; XMCD; Graphene
Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-07CH11358]
- U.S. DOE [DE-AC02-06CH11357]
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Intercalation of rare earth metals (RE = Eu, Dy, and Gd) is achieved by depositing the RE metal on graphene that is grown on silicon-carbide (SiC) and by subsequent annealing at high temperatures to promote intercalation. STM images of the films reveal that the graphene layer is defect free and that each of the intercalated metals has a distinct nucleation pattern. Intercalated Eu forms nano-clusters that are situated on the vertices of a Moire pattern, while Dy and Gd form randomly distributed nano-clusters. X-ray magnetic circular dichroism (XMCD) measurements of intercalated films reveal the magnetic properties of these REs nano-clusters. Furthermore, field dependence and temperature dependence of the magnetic moments extracted from the XMCD show paramagnetic-like behaviors with moments that are generally smaller than those predicted by the Brillouin function. XMCD measurements of RE-oxides compared with those of the intercalated REs under graphene after exposure to air for months indicate that the graphene membranes protect these intercalants against oxidation.
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