Circular dichroism in core-level photoemission from nonmagnetic and magnetic systems: A photoelectron diffraction viewpoint (abstract)

Journal Article · Mon Nov 14 23:00:00 EST 1994 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.358229· OSTI ID:7122068

Kaduwela, A P ^[1]; Xiao, H ^[2]; Thevuthasan, S ^[3]; Westphal, C; Van Hove, M A ^[1]; Fadley, C S ^[4]

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1. Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
2. Physics Department, University of California, Davis, California 95616 (United States)
3. MSIN K2-12, Battelle Pacific Northwest Laboratory, Richland, Washington 99532 (United States)
4. Physics Department, University of California, Davis, California 95616 (United States) Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)

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 2[ital p] 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 2[ital p] 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 [ital l][plus minus]1 photoelectron channels and spin-dependent scattering and diffraction.

• OSTI ID: 7122068
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 76:10; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COHERENT SCATTERING
DICHROISM
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELECTRON DIFFRACTION
ELECTRONIC STRUCTURE
EMISSION
IONIZING RADIATIONS
MAGNETIC CIRCULAR DICHROISM
MULTIPLE SCATTERING
PHOTOEMISSION
RADIATIONS
SCATTERING
SECONDARY EMISSION
X RADIATION