Abstract
Oxygen adsorption in an ordered $p(1\ifmmode\times\else\texttimes\fi{}1)$ fashion on the Fe(001) surface has been studied by empty states spectroscopies using a spin-polarized electron beam. The low-energy electron absorption and reflection display a much larger spin dependence in Fe(001)-$p(1\ifmmode\times\else\texttimes\fi{}1)\mathrm{O}$ than in Fe(001). Peak values of the spin asymmetries of the absorbed (reflected) current larger than 13% (45%) at around 9--11 eV above the Fermi level are found. Spin-resolved inverse photoemission reveals that in the same energy range the exchange splitting between majority- and minority-spin states in Fe(001)-$p(1\ifmmode\times\else\texttimes\fi{}1)\mathrm{O}$ is $\ensuremath{\sim}50%$ larger than in the clean surface.
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