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Title: Magnetic properties of Dy nano-islands on graphene

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 M 4,5 XMCD spectra at low temperatures ( T = 15 K) as a function of magnetic field assuming Dy 3+ (spin configuration 6 H 15/2) indicate that the projection of the magnetic moment along an applied magnetic field of 5 T is 3.5(3) μ B. Temperature dependence of the magnetic moment (extracted from the M 5 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 T H = 179 K in bulk Dy. No feature at the vicinity of the ferromagnetic transition of hcp bulk Dy at T c = 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.
 [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)
Publication Date:
Report Number(s):
Journal ID: ISSN 0304-8853; PII: S0304885316328591
Grant/Contract Number:
AC02-07CH11358; AC02-06CH11357
Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 435; Journal Issue: C; Journal ID: ISSN 0304-8853
Research Org:
Ames Lab., Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; dysprosium nano-islands; XMCD; STM
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1415891