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. Khajetoorians1 — 1Institute 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.