%0 Journal Article
%A Tusche, C.
%A Meyerheim, H. L.
%A Hillebrecht, F. U.
%A Kirschner, J.
%T Evidence for a mixed CoNiO layer at the Co/NiO(001) interface from surface x-ray diffraction
%J Physical review / B
%V 73
%N 12
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-57646
%P 125401
%D 2006
%Z Record converted from VDB: 12.11.2012
%X The clean and cobalt-covered NiO(001) surface was studied by surface x-ray diffraction. The NiO(001) surface prepared by annealing in air at 1000 degrees C is characterized by a strong expansion of the top interlayer spacing (approximate to 14% relative to the bulk NiO-spacing of 2.085 A) and an outward relaxation (0.28 A) of the oxygen atoms, which can be related to a high (27%) concentration of oxygen vacancy defects. In addition we find an oxygen-layer (most likely as part of the OH- anion) on top of the surface Ni atoms at a distance of 2.33 A. Deposition of 0.8 monolayers of Co induces a complex surface restructuring involving the formation of double layer CoO-islands above an oxygen deficient interfacial oxide layer ([NiCo]O-0.5) in registry with the underlying NiO single crystal. Our results support previous spectroscopic studies suggesting the presence of uncompensated interfacial spins responsible for the exchange bias.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000236467400098
%R 10.1103/PhysRevB.73.125401
%U https://juser.fz-juelich.de/record/57646