Oxygen on Fe(110): magnetic properties of the adsorbate system

Investigations concerning the electronic and magnetic properties of oxygen adsorbed on magnetized iron films were carried out by means of angle and sp in resolving photoelectron spectroscopy. Iron(1 1 0), epitaxially grown on a W(1 1 0) crystal, served as the ferromagnetic substrate. Exchange splitti ngs of the O 2p(x) derived level were detected demonstrating a magnetic cou pling between the chemisorbate and the iron layer. This observation indicat es the presence of an induced magnetic moment within the adsorbate overlaye r. Variations of the exchange splitting occurred as a function of the oxyge n coverage, energy of the exciting radiation, and detection angle of the em itted photoelectrons pointing to a k(parallel to)-dependent exchange splitt ing. High oxygen exposures lead to a FeO overlayer at the surface, showing vanishing peak separations due to the antiferromagnetic behavior of iron ox ide. (C) 1999 Elsevier Science B.V. All rights reserved.