TY - JOUR
T1 - Magnetic properties of single rare-earth atoms on graphene/Ir(111)
AU - Baltic, Romana
AU - Donati, Fabio
AU - Singha, Aparajita
AU - Wäckerlin, Christian
AU - Dreiser, Jan
AU - Delley, Bernard
AU - Pivetta, Marina
AU - Rusponi, Stefano
AU - Brune, Harald
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/7/13
Y1 - 2018/7/13
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85050515372&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.98.024412
DO - 10.1103/PhysRevB.98.024412
M3 - Article
AN - SCOPUS:85050515372
SN - 2469-9950
VL - 98
JO - Physical Review B
JF - Physical Review B
IS - 2
M1 - 024412
ER -