Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Poster Session: Cryotechnique

TT 54.2: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3

Design of a 30 mK scanning tunneling microscope for spinpolarized measurements — •Sebastian Schimmel, Danny Baumann, Alexander Horst, Ralf Voigtländer, Dirk Lindackers, Bernd Büchner, and Christian Hess — IFW Dresden, Helmholtzstrasse 20, 01069, Dresden, Germany

We present the concept of a milli-Kelvin scanning tunneling microscope system, which is particularly designed for long term STM/STS and spinpolarized measurements at a base temperature of 30 mK within magnetic fields. The low temperature is provided by a 3He/4He Dilution Refrigerator that allows measurements with very high resolution in energy and real-space for up to 7 days without refilling the liquid helium reservoir. The position of our sample inside the STM is exactly at the center of a 9-4 T vector magnet that gives us the opportunity to systematically study local magnetic structures on the nanoscale by spinpolarized-STM/STS. Furthermore, the setup contains a two-chamber ultra-high-vacuum system for sample/tip preparation and storage. To avoid that any vibrations can be transferred to the STM the whole construction will be held by a two-stage passive/active damping system. With this contribution we would like to show our progress in setting up the mentioned 30 mK STM system.