Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 80: Poster: Scanning Probe Techniques - Method Development

O 80.3: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Design of a cryogenic dip-stick tuning fork-based AFM/STM system — •christian salazar, heiko hädrich, danny baumann, thomas mühl, bernd büchner, and christian hess — Leibniz Institute for Solid State and Materials Research, Dresden, Germany

We present the design of a tuning fork-based AFM/STM system, which consists in a dip-stick device able to operate inside a helium dewar or a magnet bath cryostat. The design allows to use in the AFM mode a frequency modulation feedback loop instead of the typical optical feedback loop. Additionally, this design provides the opportunity to connect a conducting tip to one of the tuning fork electrodes in order to run the STM mode. Measurements can be carried out in the temperature range from approximately 4K to room temperature and under cryogenic vacuum conditions. The system includes a cleaving mechanism for cleaving single crystals and a capacitive automated coarse approach mechanism for bringing the tip close to the sample surface without tip or surface damage.