Angle-resolved x-ray circular and magnetic circular dichroisms: Definitions and applications

We introduce definitions of angle-resolved x-ray circular dichroism (ARXCD) and magnetic x-ray circular dichroism (ARMXCD). As defined, the much larger effect of circular dichroism (ARXCD) is separated from the smaller magnetic (ARMXCD) effect. In all materials, ARXCD is zero along mirror planes while nonzero elsewhere. ARMXCD is nonzero only in magnetic materials. The measurement and analysis of ARMXCD allow element specific surface magnetism and surface structure as well as their inter-relationship to be studied as functions of the outgoing electron's directionpublished_or_final_versio

Magnetic x-ray circular dichroism in spin-polarized photoelectron diffraction

Symposia AA – Applications of Synchrotron Radiation Techniques to Materials ScienceThe first structural determination with spin-polarized, energy-dependent photoelectron diffraction using circularly-polarized x-rays is reported for Fe films on Cu(001). Circularly-polarized x-rays produce spin-polarized photoelectrons from the Fe 2p doublet, and intensity asymmetries in the 2p3/2 level are observed. Fully spin-specific multiple scattering calculations reproduce the experimentally-determined energy and angular dependences. A new analytical procedure which focuses upon intensity variations due to spin-dependent diffraction is introduced. A sensitivity to local geometric and magnetic structure is demonstrated.link_to_OA_fulltextThe 1994 Fall Meeting of the Materials Research Society (MRS), Boston, MA., 27 November-2 December 1994. In Materials Research Society Symposium Proceedings, 1995, v. 375, p. 101-10