期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 435, 期 -, 页码 212-216出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2017.04.007
关键词
Dysprosium; Nano-islands; XMCD; STM
资金
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-07CH11358]
- U.S. DOE [DE-AC02-06CH11357]
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,M-5 XMCD spectra at low temperatures (T = 15 K) as a function of magnetic field assuming Dy3+ (spin configuration H-6(15/ 2)) indicate that the projection of the magnetic moment along an applied magnetic field of 5 T is 3.5(3) mu(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 similar to 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. (C) 2017 Elsevier B.V. All rights reserved.
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