title: Surface and bulk spin ordering of antiferromagnetic materials: NiO(111).
abstract: We present a study of the prototypical NiO(111) antiferromagnet by nonresonant surface x-ray magnetic scattering. Direct access to the antiferromagnetic surface and bulk spin ordering is demonstrated. Our data support a first order antiferromagnetic to paramagnetic transition. A quantitative determination of the magnetization profile is proposed. It is shown that the NiO(111) surface spins remain ordered at higher temperatures than in the bulk and that the blocking temperature in exchange coupled ferromagnetic-NiO interfaces is most likely related to an S-domain structure loss occurring 25 K below the Ne el temperature.
authors.affiliation: CEA-Saclay, DSM/DRECAM/SPCSI, 91191 Gif-Sur-Yvette, France. abarbier@cea.fr
authors.forename: Antoine
authors.initials: A
authors.lastname: Barbier
authors.forename: Cristian
authors.initials: C
authors.lastname: Mocuta
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Neubeck
authors.forename: Mattia
authors.initials: M
authors.lastname: Mulazzi
authors.forename: Flora
authors.initials: F
authors.lastname: Yakhou
authors.forename: Karine
authors.initials: K
authors.lastname: Chesnel
authors.forename: Albéric
authors.initials: A
authors.lastname: Sollier
authors.forename: Christian
authors.initials: C
authors.lastname: Vettier
authors.forename: François
authors.initials: F
authors.lastname: de Bergevin