The Set-Up Of Magnetic Circular Dichroism Absorption Spectroscopy Of Hard X-Rays Range At Beijing Synchrotron Radiation Laboratory

For the first time X-ray magnetic circular dichroism (XMCD) absorption spectroscopy of hard X-rays was setup at the beamline 1W1B and XAFS experimental station, Beijing Synchrotron Radiation Facility (BSRF). In combination with conventional X-rays absorption fine structure (XAFS) spectroscopy, the developed technique can provide an alternative tool for outside users and in house research. It is expected the developed XMCD can be applied to the study of magnetism and magnetic materials, especially, magnetic multilayer by means of transmission, (from room to low temperature) fluorescence and total-electron-yield (TEY) mode. Limited by the energy range of monochromator, the measurements can cover the L edges of a few of 5d- transitional metals (Pt, Ir, Au etc), some rare earth elements (Gd etc) and the K-edges of some 3d transition metals (Fe, Co, Ni etc). As a demonstration, the XMCD spectra of disordered Pt-Fe disorder alloys were collected at Pt L_2,3 edges in the transmission mode and a dramatic XMCD signal was observed. Based on the sum rule of XMCD, orbital and spin moments of Pt atoms for each sample are calculated. In addition, the Pt-Co multilayer thin films at Pt L_2,3 edges were measured in the total-electronic-yield mode and a consistent XMCD signal was observed. Finally the systematic errors related to the instrumention and measuring procedures were presented and discussed.