OK-edge x-ray magnetic circular dichroism of atomic O adsorbed on an ultrathin Co/Cu(100) film: Comparison with molecular CO on Co/Cu(100) - art. no.132405
K. Amemiya et al., OK-edge x-ray magnetic circular dichroism of atomic O adsorbed on an ultrathin Co/Cu(100) film: Comparison with molecular CO on Co/Cu(100) - art. no.132405, PHYS REV B, 6413(13), 2001, pp. 2405
We observed O K-edge x-ray magnetic circular dichroism (XMCD) of atomic O a
dsorbed on a fcc Co thin film grown epitaxially on Cu(100). The XMCD of c(2
x2)O showed a negative sign at the O1s-->2p transition. The negative sign i
ndicates parallel alignment of the O orbital moment with the substrate magn
etization. This finding is in contrast to the CO/Co/Cu(100) case where a po
sitive XMCD was observed at the O1s -->CO2 pi* transition. A possible expla
nation for this discrepancy is proposed referring to recent theoretical pre
diction.