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Title: Magnetic properties of Dy nano-islands on graphene

Journal Article · · Journal of Magnetism and Magnetic Materials
 [1];  [1];  [1];  [2];  [2];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)

Here, we have determined the magnetic properties of epitaxially grown Dy islands on graphene/SiC(0001) that are passivated by a gold film (deposited in the ultra-high vacuum growth chamber) for ex-situ X-ray magnetic circular dichroism (XMCD). Our sum-rule analysis of the Dy M4,5 XMCD spectra at low temperatures (T = 15 K) as a function of magnetic field assuming Dy3+ (spin configuration 6H15/2) indicate that the projection of the magnetic moment along an applied magnetic field of 5 T is 3.5(3) μB. Temperature dependence of the magnetic moment (extracted from the M5 XMCD spectra) shows an onset of a change in magnetic moment at about 175 K in proximity of the transition from paramagnetic to helical magnetic structure at TH = 179 K in bulk Dy. No feature at the vicinity of the ferromagnetic transition of hcp bulk Dy at Tc = 88 K is observed. However, below ~130 K, the inverse magnetic moment (extracted from the XMCD) is linear in temperature as commonly expected from a paramagnetic system suggesting different behavior of Dy nano-island than bulk Dy.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358; AC02-06CH11357
OSTI ID:
1371900
Alternate ID(s):
OSTI ID: 1415891
Report Number(s):
IS-J-9343; PII: S0304885316328591
Journal Information:
Journal of Magnetism and Magnetic Materials, Vol. 435, Issue C; ISSN 0304-8853
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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