Exchange splitting and ferromagnetic order in a monolayer film of cobalt on Cu(111)

The analysis of exchange splitting in a monolayer and a double layer of Co on Cu(111), which was given recently by Miranda et al. on the basis of their photoemission spectra of such films, is completed by combination with former measurements of the spontaneous magnetization in these films. The result is strong evidence for the intra-atomic origin of exchange splitting in Co, which therefore cannot be taken as a direct measure of long-range-order spontaneous magnetization.