Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Magnetic Thin Films II
MA 20.4: Vortrag
Mittwoch, 28. März 2007, 16:00–16:15, H5
Morphology and electronic structure of Cobalt islands grown on Pd(111) — •Marta Waśniowska1, Wulf Wulfhekel1,2, Marek Przybylski1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle, Germany — 2Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany
We have investigated Co islands grown on Pd(111) at three different temperatures, i.e. 180 K, 300 K, 550 K. The island shapes and electronic structure of these Co islands were studied with scanning tunneling microscopy and scanning tunneling spectroscopy. Depending on the growth temperatures, monolayer or double layer islands are formed in the early stages of growth. On the hexagonal double layer islands formed at 300 K a Moiré pattern appears. The unit cell of the Moiré pattern contains Co in fcc and hcp stacking, as well as Co in the bridge or on top position. Both fcc and hcp regions show similar features in dI/dU spectra. However, the surface state peak positions are slightly shifted. Triangular monolayer high islands formed at 550 K either continuous in fcc or hcp stacking. The position of the surface state peak depends on stacking of the island, as well. The magnetic structure of the islands was investigated by means of spin polarized scanning tunneling spectroscopy. The measurements reveal a spin contrast reflecting the out-of-plane magnetization of the islands.