Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Surface magnetism I (jointly with MA)
O 46.4: Vortrag
Mittwoch, 16. März 2011, 12:00–12:15, CHE 184
Spin-Resolved Investigations of the Exchange Split Gd Surface and Image-Potential State — •Beatrice Andres1,2, Kristian Döbrich1, Marko Wietstruk1, Anke B. Schmidt3, Markus Donath3, and Martin Weinelt1,2 — 1Max-Born-Institut, 12489 Berlin — 2Fachbereich Physik, Freie Universität Berlin, 14195 Berlin — 3Physikalisches Institut, Westfälische Wilhelms-Universität Münster, 48149 Münster
The study of image-potential states (IPS) in front of ferromagnetic surfaces provides information about the magnetic properties of surfaces and thin films. Recent investigations on IPS revealed exchange splittings Δ Eex in Fe, which persist even above the Curie temperature TC [1].
Gd(0001) exhibits a d-derived surface state (SS) with Δ Eex>0 above TC [2]. We used the occupied majority spin component of this state to populate the first (n=1) image potential state on a 100-Å-thick Gd film on W(110) with the second harmonic of our Ti:Sa laser (hν = 3.30 eV). By probing with the fundamental IR pulse (hν=1.65 eV), we investigated the binding energy and exchange splitting of the IPS as a function of the temperature.
[1] M. Pickel et. al., Phys. Rev. Lett. 104, 237204 (2010).
[2] M. Getzlaff et al., J. Magn. Magn. Mater. 184, 155 (1998).