TY  - JOUR
AU  - Tusche, C.
AU  - Meyerheim, H. L.
AU  - Hillebrecht, F. U.
AU  - Kirschner, J.
TI  - Evidence for a mixed CoNiO layer at the Co/NiO(001) interface from surface x-ray diffraction
JO  - Physical review / B
VL  - 73
IS  - 12
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-57646
SP  - 125401
PY  - 2006
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000236467400098
DO  - DOI:10.1103/PhysRevB.73.125401
UR  - https://juser.fz-juelich.de/record/57646
ER  -