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

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Title
Magnetic properties of single rare-earth atoms on graphene/Ir(111)
Author(s)
Romana Baltic; Fabio Donati; Aparajita Singha; Christian Wäckerlin; Jan Dreiser; Bernard Delley; Marina Pivetta; Stefano Rusponi; Harald Brune
Publication Date
2018-07
Journal
Physical Review B, v.98, no.2, pp.024412 -
Publisher
American Physical Society
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
URI
https://pr.ibs.re.kr/handle/8788114/5250
ISSN
2469-9950
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
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