Abstract
Magnetic circular dichroism (MCD) in x-ray absorption represents an exciting new technique for studying and imaging magnetic systems. However, there are to date relatively few studies of dichroism in the inherent process involved: photoelectron emission. We will here illustrate that photoelectron diffraction (PD) theory provides a fruitful way of analyzing dichroism data for both nonmagnetic and magnetic systems. Circular dichroism (CD) has been observed in core-level photoemission from nonmagnetic systems: C 1s from CO/Pd(111) and Si 2p from Si(100). For CO/PD(111), chirality in the experimental geometry is readily discernible, but for Si(100), it is more difficult to define the chirality with simple vector relationships. PD effects implicitly contain all information on such core-level dichroism, and we will present multiple-scattering simulations of the observations to date. We will also discuss the role of such CD effects in core-level MCD measurements, using Fe 2p emission from magnetically aligned Fe(110) as an example. The analysis of such MCD data has so far been qualitative. We will present a more quantitative analysis including final-state effects such as the interference of l±1 photoelectron channels and spin-dependent scattering and diffraction.
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