Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.79: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Growth of nanostructures for multi-tip STM investigations — •Marcus Blab, Vasily Cherepanov, and Bert Voigtländer — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany, and JARA-Fundamentals of Future Information Technology

The main field of research of a multi-tip STM is the investigation of self assembled conducting nanostructures. The study of silicide nanostructures is often a benchmark test for a multi-tip STM. Therefore, we searched for the ideal parameters to grow MnSi-nanowires on a Si(111)-7x7 surface. 2 µm long MnSi-nanowires occur at a sample-temperature of 590 ^∘C and a low deposition rate of 0.13 ML/min. These nanowires with typical diameters and height of ∼20 Å are ideal to contact and investigate their electrical properties by a multi-tip STM.

Small defects in epitaxial layers can be used to search for the Landauer conductivity dipole. Defects which occur by depositing Bi on Si(111)-7x7 at RT, are of the size between 10-100 nm. To reduce the defect-size we deposit small Si-cluster on a flat Bi-layer, which change the surface state. These defects can be explored by scanning tunneling potentiometry using a multi-tip STM.