Exchange-split adsorbate bands: The role of substrate hybridization
Abstract
Spin-split adsorbate-induced bands have been observed for p(1×1) oxygen and c(2×2) sulfur on Fe(001) by spin-polarized angle-resolved photoemission. For the pz symmetry orbitals, the exchange splitting is considerably larger at the Brillouin-zone center (1.3 eV for 0, 0.5 eV for S) than at the zone edge (0.25 and 0.2 eV, respectively). This is attributed to enhanced hybridization with substrate & orbitals when the adsorbate pz band overlaps the bulk continuum. Our observation of an exchange splitting provides evidence of a small magnetic moment on the adsorbate atoms. Our results also indicate that the adsorbate layer is ferromagnetically aligned with the substrate.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 1988
- DOI:
- 10.1103/PhysRevLett.61.2257
- Bibcode:
- 1988PhRvL..61.2257J
- Keywords:
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- 79.60.Gs