Magnetic exchange splitting of one layer of cobalt deposited on top of the (111) surface of copper

Abstract

We have measured angle-resolved photoemission spectra for one and two ordered layers of Co deposited on top of a Cu(111) surface using synchrotron radiation ($25<~h\nu <~80$ eV). The spectrum at normal emission for one monolayer of Co presents the same exchange-splitting-induced three-peak structure that the spectrum of Co(0001). The magnetic-exchange-splitting values at the $\overline{\Gamma }$ and $\overline{K}$ points of the two-dimensional Brillouin zone are 0.7 and 0.5 eV, respectively.