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

Circular magnetic x-ray dichroism (CMXD) was observed at the Pt and Ir L2,3 edges in the multilayered structures 25 . (4 angstrom Co+30 angs trom Pt) and 25 . (4 angstrom Co+ 11 angstrom Pt+8 angstrom Ir+ 11 ang strom Pt). The samples were prepared by sputtering and show a large pe rpendicular anisotropy. The magnetic absorption at the Pt and Ir L2,3 edges was measured in an external magnetic field of 0.15 T perpendicul ar to the surface. The results indicate a significant spin polarizatio n of the Pt and Ir layers. By comparison with the corresponding CMXD s ignals of Pt and Ir impurities in a ferromagnetic iron host we estimat ed the local spin and orbital moments. The results show that the inner most three monolayers in both systems couple ferromagnetically to the Co layers with an average magnetic moment of about 0.01 mu(B).