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Abstract
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=15K) 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 5T 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 175K in proximity of the transition from paramagnetic to helical magnetic structure at TH=179K in bulk Dy. No feature at the vicinity of the ferromagnetic transition of hcp bulk Dy at Tc=88K is observed. However, below ∼130K, 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.
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