Electronic structures of nanostructured transition metals on the Au(788) surface

Abstract

The electronic structures of nanostructured transition metals (Fe, Co, Ni) grown by step decoration of the Au(788) surface are investigated by normal emission angle-resolved photoemission spectroscopy (ARPES). As the coverage of the transition metals is increased, the intensity of Au 5d valence bands decreases but the peak positions do not change, suggesting that the mixing between Au 5d and 3d of transition metals is negligibly weak. The coverage dependences of ARPES spectra near the Fermi level .E F / for Fe, Co and Ni are discussed and compared with the photoemission results on bulk materials. In the higher coverage regions, we identify the observed 3d peaks near E F as ferromagnetic exchange splitting bands with similar exchange energy to the bulk. In contrast, at lower coverages, the exchange splitting vanishes for Fe and Co and becomes small for Ni. The origins of this behaviour are attributed to atomic volume, structural dimensionality and finite temperature effects.

Fabrication of 1D metal nanostructures on a vicinal Au(111) surface

“…In our recent works, it was confirmed by scanning tunneling microscopy (STM) that dosed Fe atoms are adsorbed at Au steps and form 1D nanostructures [18]. Furthermore, angle-resolved pho-toemission spectroscopy over a wide range of Fe coverages revealed that these Fe nanostructures have 1D nature not only about the geometric feature but also about the electronic states, which seems to be reinforced by the 1D electronic structure of underlying vicinal Au(111) substrates [19].…”