DISTRIBUTION OF MAGNETIC-MOMENTS IN CO PT AND CO/PT/IR/PT MULTILAYERSDETECTED BY MAGNETIC-X-RAY ABSORPTION/

Measurements of the spin-dependent absorption have been performed at t he L2,3 edges in Pt and Ir in the multilayered structures 4 angstrom C o + x angstrom Pt (x = 9, 16, 23, 30, 40) and 4 angstrom Co + 11 angst rom Pt + 8 angstrom Ir + 11 angstrom Pt. The samples were prepared by sputtering and evaporating, respectively, and show a large perpendicul ar anisotropy. The measured circular magnetic X-ray dichroism (CMXD) p rofiles indicate a significant spin polarization of the Pt and the Ir interlayer. The results show that the moments of the Pt interlayers as well as of the innermost Ir layers couple ferromagnetically to the Co layers. The experimental findigs are compared with the magnetic momen t distribution for sharp interfaces obtained from linear muffin tin or bital (LMTO) band structure calculations.