  Mn 2p soft X-ray absorption (XAS) spectroscopy excited with circularly
polarized synchrotron radiation has been applied to a new class of material,
c(2x2)CuMn/Cu(001) two-dimensional ordered surface alloy. A significant X-ray
magnetic circular dichroism (XMCD) signal has been clearly observed at T=25K,
indicating the existence of the ferromagnetic state under the external magnetic
field of 1.4 Tesla. The lineshape analyses of the XAS and XMCD spectra clearly
show that the Mn 3d state is rather localized and has a high spin magnetic
moment due to its half-filled character.
