The surface magnetism of one monolayer Mn atoms on GaAs(001) surface is stu
died by the self-consistent tight-binding linear muffin-tin orbital method.
It is found that the magnetic ordered phases (ferromagnetic and antiferrom
agnetic) are more favorable than the paramagnetic one, the density of state
s peak fdr below the Fermi level observed in synchrotron radiation photoemi
ssion Study has been identified as due to the contribution of Mn 3d majorit