Regensburg 2004 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 22: Postersitzung
DS 22.20: Poster
Dienstag, 9. März 2004, 14:30–17:00, Poster B
Interface roughness of laser deposited Fe/MgO multilayers — •Andreas Meschede1, Christian Fuhse2, and Hans-Ulrich Krebs1 — 1Institut für Materialphysik, Universität Göttingen, Tammanstrasse 1, 37077 Göttingen — 2Institut für Röntgenphysik, Universität Göttingen, Geiststrasse 11, 37073 Göttingen
Metal/MgO multilayers with double layer periods in the nanometer range were deposited by pulsed laser deposition (PLD) in ultra high vacuum and in an inert gas atmosphere (Ar). The interface roughness of less than 0.5 nm mainly depends on the bilayer thickness and increases for ultrathin films, but only slightly depends on the number of bilayers. To understand the important mechanisms of roughening und smoothing during the deposition of multilayers, Fe-MgO bilayers were produced and characterized by x-ray reflectivity. That shows that the MgO-Layer smooths the rough Fe-surface and so avoids a cumulative accreation of the interface roughness with increasing number of bilayers. The obtained interface roughness also strongly depends on the gas pressure and thus on the kinetic energies of the deposited particles, which will be discussed.