title: Magnetic moments at the surface of antiferromagnetic NiO(100).
abstract: The orientation of magnetic moments at the (100) surface of antiferromagnetic NiO single crystals is studied by x-ray linear magnetic dichroism in photoemission microscopy. T domains are observed terminating at the surface, with domain boundaries running mostly along in-plane [10] directions. From the detailed polarization dependence we find that the magnetic surface structure of a cleaved crystal is bulk terminated. This is in contrast to sputtered surfaces, where magnetic moments lie within the surface plane, forming a magnetically relaxed structure. These findings are of importance for understanding the exchange bias phenomenon.
authors.affiliation: Institut für Angewandte Physik, Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany.
authors.forename: F U
authors.initials: FU
authors.lastname: Hillebrecht
authors.forename: H
authors.initials: H
authors.lastname: Ohldag
authors.forename: N B
authors.initials: NB
authors.lastname: Weber
authors.forename: C
authors.initials: C
authors.lastname: Bethke
authors.forename: U
authors.initials: U
authors.lastname: Mick
authors.forename: M
authors.initials: M
authors.lastname: Weiss
authors.forename: J
authors.initials: J
authors.lastname: Bahrdt