Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Scanning probe methods)

O 35.16: Poster

Tuesday, March 15, 2011, 18:30–22:00, P3

Design of a low temperature four-tip Scanning Tunneling Microscope — •Hubertus Junker, Vasily Cherepanov, Peter Coenen, Helmut Stollwerk, and Bert Voigtländer — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany, and JARA-Fundamentals of Future Information Technology

The design of a low temperature ultra high vacuum (UHV) 4-tip Scanning Tunneling Microscope (STM) capable of charge and magneto transport measurements is presented. Four individual beetle-type STM units are stacked into each other in order to make the design as compact as possible. For the coarse approach of the tip towards the sample a new developed ultra compact nonpositioner which has a diameter of less than 3 mm is used. This multi tip STM is located inside the UHV part of a liquid Helium cryostat, which additionally hosts a 8 T superconducting magnet. In order to navigate the four tips a SEM is installed. The scanning areas on the sample overlap sufficiently in order to contact nanostructures with all four tips at the same time and execute transport measurements. To isolate the experiment from external vibrations, the chamber is located in a specially designed room. This room is sound protected and its 100 t concrete base plate rests on four air damping feet with a resonance frequency of 0.7 Hz. During tunneling, the experiment is controlled from the outside.