Observation of xray magnetic circular dichroism at the Rh M2,3 edge in Co Rh alloys

edge of Rh in Co-Rh alloys shows measurable x-ray magnetic circular dichroism. Such dichroism is not present, however, for analogous alloys of Co-Ru. The induced Ru magnetic moment, if any, is thus demonstrated to be significantly smaller than the induced Rh moment in otherwise similar Co alIoys. X-ray magnetic circular dichroism (XMCD) is a useful technique for the study of magnetic systems. In XMCD, the absorption coefficient of circularly polarized x rays is mea- sured as a function of photon energy. Near a core level ab- sorption edge, the absorption coefficient is seen to vary de- pending on the cosine of the angle between the x-ray polarization and the sample magnetization. XMCD can be used to determine the net magnetization, projected onto the s-ray polarization axis, of the individual elemental species in a complex sample. Published studies using XMCD have considered diverse systems, including the