Regensburg 2002 – wissenschaftliches Programm
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MA: Magnetismus
MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111
MA 10.111: Poster
Dienstag, 12. März 2002, 15:00–19:00, Bereich A
4f-spin order of the Gd surface monoxide — •Oleg Krupin1, J. E. Prieto1, Günter Kaindl1, Serguej Gorovikov1,2 und Kai Starke1 — 1Fachbereich Physik, Freie Universität Berlin, Germany — 2Maxlab, Lund, Sweden
It has been shown recently that oxygen adsorption on Gd(0001) leads to the formation of an epitaxial surface monoxide. A pronounced temperature dependent 5d valence-state exchange splitting [1] indicates the existence of long-range spin order, however it remains finite even above the bulk Curie temperature.
Here we report on an MDPE study
(Magnetic Dichroism in Core-Level Photoemission [2])
employing linearly and circularly polarized synchrotron radiation.
A clear magnetic dichroism signal was observed for the
bulk component of the Gd 4f-photoemission line,
indicating ferromagnetic spin order of the sub-surface
atomic layers. Yet the chemically shifted surface-oxide 4f component
reveales
a complicated dichroic signal that widely changes with temperature.
Based on this finding,
models of possible spin order of the surface monoxide phase are
discussed.
This work has been supported by the Deutsche Forschungsgemeinschaft (Sfb
290, TP A6)
and by the BMBF (DESY-HS, 05 KS1 KEC/2).
[1] C. Schüßler-Langeheine et al., Phys. Rev. B 60, 3449 (1999)
[2] K. Starke, Magnetic Dichroism in Core-Level Photoemission, (Springer, Berlin, Heidelberg, 2000)