Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.43: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Observation of out-of-plane spin components in antiferromagnetic NiO(100) — •W. G. Park, U. Mick, and E. Kisker — Institut für Angewandte Physik, Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf
By using x-ray magnetic linear dichroism(XMLD) we investigated an in-situ cleaved NiO(100) surface. We present data obtained by surface sensitive techniques like X-ray photoemission microscopy (XPEEM), x-ray absorption spectroscopy (XAS) together with images showing in-plane and out-of-plane spin alignments. Local images show clearly uncompensated surface and antiferromagnetic domains with perpendicular components to the surface. This kind of domain was not directly observed both in bulk NiO and in thin film until now because of the small domain size (≈50nm) in the film, symmetry breaking and surface properties. Ni L2 XAS of the sample annealed over the Neel-temperature (523K) indicates the missing local exchange field described in the atomic multiplet theory and shows its polarization dependence. Interface oxidation between an antiferromagnetic oxide and a ferromagnetic thin film as speculated earlier was not observed in Fe-overlayers evaporated on the NiO surface at the room temperature. We thank Dr.Senf (BESSY) for his support. This work was supported by the BMBF (Grant No. 05KS 1PFA/3).