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 17.55: Poster

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

A UHV-STM system for measurements at 4 K with 3D-rotatable magnetic field — Torge Mashoff, Marco Pratzer, and •Markus Morgenstern — 2. Physikalisches Institut B, RWTH Aachen, Otto-Blumenthal-Straße, 52074 Aachen

We designed and built a 3-chamber ultra high vacuum system with a 4.2 K cryostat containing three superconducting magnets which allow us to apply fields of 7 T, 3 T and 0.5 T in different directions and a full rotatable field of 0.5 T. The system will be equipped with a homebuilt scanning tunnelling microscope providing a tip exchange mechanism and a sample positioning stage. The STM features a very compact design to increase its stability and resonance frequencies. The satellite chambers contain several devices for sample and tip preparation including heating up to 2300 K, sputtering and material evaporation. The whole system is placed on damping legs inside an acoustically insulating room. First test measurements will be presented.