BAND THEORETICAL INVESTIGATION OF CIRCULAR MAGNETIC-X-RAY DICHROISM IN FE AND CO MULTILAYERS

A band theoretical study of circular magnetic X-ray dichroism (CMXD) i n Fe and Co multilayers [Fe(Co)(2)Cu-6(001), Fe1Cu(Ag, Au)(5)(001), Co 2Pd4(111) and Co2Ptm(111) (m = 1, 4, 7)] has been carried out. The orb ital magnetic moment given by the CMXD sum rule is found to be too sma ll by up to 50%. Nevertheless, there is a linear relationship between the integrated CMXD signal and the orbital magnetic moment for each io n species. The calculated magnetic dipole moment is small in the Co sy stems, but is comparable to the orbital magnetic moment in the Fe syst ems. The CMXD sum rule for spin magnetization is found to give rather accurate spin magnetic moments (errors within 15%) for the Co systems, and also for the Fe systems if the magnetic dipole moment is included .