The electronic and magnetic properties of a Mn overlayer on Co(001) ar
e investigated by using a tight-binding Hubbard-type Hamiltonian. Mult
iple possible magnetic arrangements are investigated for the Mn atoms.
A competition between c(2 X 2) in-plane antiferromagnetic ordering an
d antiferromagnetic coupling between a ferromagnetic Mn monolayer and
a Co substrate is obtained. These results are compared to recent eleme
nt specific X-ray magnetic circular dichroism measurements.