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Electronic states of ultrathin Co layers on Cu
Author(s) -
Lee Hangil,
Lee Dohyun,
Kim W.,
le Hung N.,
Kim Hyojin,
Hwang Chanyong
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200777112
Subject(s) - overlayer , vicinal , valence band , annealing (glass) , materials science , photoemission spectroscopy , surface states , electronic structure , condensed matter physics , chemical physics , chemistry , x ray photoelectron spectroscopy , surface (topology) , band gap , optoelectronics , computational chemistry , nuclear magnetic resonance , metallurgy , physics , geometry , organic chemistry , mathematics
We studied ultrathin Co overlayers on top of vicinal Cu(100) and Cu(111) surface using high resolution photoemission spectroscopy to clarify the phenomena of surface alloying at low coverage. The valence band spectrum of Co/Cu(100) clearly shows the change in its electronic structure. A peak at the binding energy of 0.3 eV represents the mixing of Co and Cu at the surface, as has been reported by STM. This state becomes more enhanced upon annealing. Mixing the Co overlayer with Cu atoms on top of Cu (111) surface is relatively small at room temperature. Instead, wetting along the step edge has been found for low coverage. Interesting state responsive to the electric field of the incident photon has been found and a possible origin has been discussed. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)