CORE-LEVEL MAGNETIC-CIRCULAR-DICHROISM STUDY OF AN FE SINGLE-CRYSTAL,FE-PT ALLOYS, AND AN FE PT MULTILAYER/

We have studied the local magnetic states of a single-crystalline Fe f ilm, annealed and as-deposited Fe-Pt alloy films, and an Fe/Pt multila yer by magnetic circular dichroism (MCD) in core-level absorption. The MCD spectra around the Fe M(2,3) edges unambiguously reveal an enhanc ed 3d orbital moment in the alloys and multilayer relative to that in Fe metal. MCD signals were also observed at the Pt N-6,N-7 and O-2 edg es in the alloys and multilayer, showing induced magnetic moments on P t atoms. A comparison of the MCD spectral pattern at the Pt N-6,N-7 ed ges with that at the Fe M(2,3) and Pt O-2,O-3 edges gives clear eviden ce that the induced Pt moments are aligned parallel to the Fe moments. Fine MCD features observed at the Pt N-6,N-7 edges indicate that the Pt 5d partial density of states just above the Fermi level is higher f or the majority-spin states than for the minority-spin states.