AVS 53rd International Symposium
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuA

Paper MI-TuA5
The Electronic Band Structure of CoS2

Tuesday, November 14, 2006, 3:20 pm, Room 2006

Session: Magnetic Thin Films and Multilayers
Presenter: N. Wu, University of Nebraska-Lincoln
Authors: N. Wu, University of Nebraska-Lincoln
Y. Losovyj, Louisiana State University
D. Wisbey, University of Nebraska-Lincoln
L. Wang, University of Nebraska-Lincoln
M. Manno, University of Nebraska-Lincoln
C. Leighton, University of Minnesota
P. Dowben, University of Nebraska-Lincoln
Correspondent: Click to Email
We have undertaken angle resolved photoemission studies of CoS2(100) in order to map out the surface and bulk band structure of this high polarization material. The spectral features have been assigned from resonant photoemission, while the inner potential has been obtained from the critical points of the experimental band structure. Several photoemission resonances have been identified in this system for a variety of occupied "valence" electronic bands, with particularly strong resonances at the Co 3p core edges. Surface composition and surface order is seen to be strongly dependent upon surface preparation, with sulfur segregation seen to be easily facile. The surface is seen to be highly ordered in low energy electron diffraction under some conditions and both surface and bulk band states can be identified. A strongly dispersing s-p band dominates the Fermi level near the Brillouin zone edge, while Co d-band states dominate the Fermi level near the Brillouin zone center. These results are discussed in terms of the conduction electron spin polarization of this system.