Surface electronic properties of Fe(100)

Abstract

The band dispersion and magnetic exchange splitting of surface states and surface resonances on Fe(100) are extensively studied using angle-resolved photoemission spectroscopy. Surface-sensitive features in photoemission spectra are observed along the $\bar{\Delta }$, $\bar{\Sigma }$, and $\bar{Y}$ directions of the two-dimensional Brillouin zone. Polarized light from the Tantalus storage ring is used to separate excitations from even- and odd-symmetry initial states along the $\bar{\Delta }$ and $\bar{\Sigma }$ directions. Features identified as surface states are analyzed in relation to bulk electronic states of the same symmetry and spin projected onto the two-dimensional Brillouin zone. Binding energies and dispersion of the features identified as surface states are in good agreement with recent slab calculations over most of the two-dimensional Brillouin zone probed by the experiments. Several surface states and resonances are observed which do not appear to have been predicted theoretically. The results reported in this paper represent an attempt to provide a comprehensive experimental evaluation of the ability of current generation slab calculations to correctly predict surface electronic properties of magnetic surfaces.