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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 80: Poster: Scanning Probe Techniques - Method Development

O 80.5: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Design and performance of a UHV spin-polarized STM operating at 30 mK in vector magnetic fields — •Henning von Allwörden1, Elze J. Knol1, Andreas Eich1, Jan Hermenau2, Andreas Sonntag2, Jan W. Gerritsen1, Daniel Wegner1, and Alexander A. Khajetoorians11Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands — 2Fachbereich Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany

Scanning tunneling microscopy (STM) has developed into a leading technique to explore atomic-scale magnetism. However, to enhance the energy resolution in order to probe spin-dependent phenomena, our instrument design is based on a wet dilution refrigerator. Its base temperature is around 30 mK and it is capable of vector magnetic fields in two dimensions. The connection to an ultra-high vacuum (UHV) system allows in-situ sample preparation and transfer. The setup is situated in an ultra-quiet and ultra-low noise laboratory (SPiN laboratory at the IMM in Nijmegen), and also special care was taken to do signal filtering in-situ. We demonstrate the instrumentational performance by showing the noise characteristics at the tunnel junction, atomic resolution of a surface and measured quasi-particle interference (QPI), showing the ability to perform QPI mapping. Furthermore, we illustrate spectra of low temperature BCS superconductors and discuss the electron temperature.

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