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Magnetic properties of single rare-earth atoms on graphene/Ir(111)

Title
Magnetic properties of single rare-earth atoms on graphene/Ir(111)
Authors
Baltic R.Donati F.Singha A.Wäckerlin C.Dreiser J.Delley B.Pivetta M.Rusponi S.Brune H.
Ewha Authors
Fabio Donati
SCOPUS Author ID
Fabio Donatiscopus
Issue Date
2018
Journal Title
Physical Review B
ISSN
2469-9950JCR Link
Citation
Physical Review B vol. 98, no. 2
Publisher
American Physical Society
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism to study the magnetic properties of single rare-earth (RE) atoms (Nd, Tb, Dy, Ho, and Er) adsorbed on the graphene/Ir(111) surface. The interaction of RE atoms with graphene results for Tb in a trivalent state with 4fn-1 occupancy, and in a divalent state with 4fn occupancy for all other studied RE atoms (n corresponds to the 4f occupancy of free atoms). Among the studied RE on graphene/Ir(111), Dy is the only one that shows magnetic hysteresis and remanence at 2.5 K. By comparing measured spectra and magnetization curves with multiplet calculations, we determine the energy diagram of the magnetic states and show for each element the magnetization reversal process that determines the timescale of its magnetic bistability. © 2018 American Physical Society.
DOI
10.1103/PhysRevB.98.024412
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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