Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)

O 17.65: Poster

Montag, 26. März 2007, 17:30–20:30, Poster C

Preparation of two-dimensional Fe-Cr-Fe multistripes on W(110) — •Torsten Methfessel and Hans Joachim Elmers — Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudingerweg 7, D-55099 Mainz

Multilayers consisting of alternating layers of Fe an Cr are interesting because of the discovery of the giant magnetoresistance effect (GMR). In analogy to these multilayersystems we were interested in the possibility to prepare two dimensional multistripes on W(110) by sequential epitaxy and self organized growth of pseudomorphic Fe and Cr. These multistripes have been investigated using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). With these methods we were able to distinguish between different materials along the edges of the W-substrate. Comparing the STS spectra of the multistripes with those of pseudomorphic pure element monolayers we could show that multistripes of alternating pure Fe and Cr stripes grow at appropriate substrate temperatures. Interdiffusion occurs for temperatures larger than 500 K, while deposition at room temperature leads to island growth.