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Title: Intercalated rare-earth metals under graphene on SiC

Abstract

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 Moirè 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.

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1493903
Alternate Identifier(s):
OSTI ID: 1494933
Report Number(s):
IS-J-9884
Journal ID: ISSN 0304-8853; 148750
Grant/Contract Number:  
AC02-06CH11357; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 474; Journal Issue: C; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Dy; Eu; Gd; XMCD; graphene; intercalation; rare earths

Citation Formats

Anderson, Nathaniel A., Hupalo, Myron, Keavney, David, Tringides, Michael, and Vaknin, David. Intercalated rare-earth metals under graphene on SiC. United States: N. p., 2018. Web. doi:10.1016/j.jmmm.2018.11.007.
Anderson, Nathaniel A., Hupalo, Myron, Keavney, David, Tringides, Michael, & Vaknin, David. Intercalated rare-earth metals under graphene on SiC. United States. doi:10.1016/j.jmmm.2018.11.007.
Anderson, Nathaniel A., Hupalo, Myron, Keavney, David, Tringides, Michael, and Vaknin, David. Sat . "Intercalated rare-earth metals under graphene on SiC". United States. doi:10.1016/j.jmmm.2018.11.007.
@article{osti_1493903,
title = {Intercalated rare-earth metals under graphene on SiC},
author = {Anderson, Nathaniel A. and Hupalo, Myron and Keavney, David and Tringides, Michael and Vaknin, David},
abstractNote = {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 Moirè 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.},
doi = {10.1016/j.jmmm.2018.11.007},
journal = {Journal of Magnetism and Magnetic Materials},
number = C,
volume = 474,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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This content will become publicly available on November 3, 2019
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