Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 93: Scanning Probe Techniques: Method Development

O 93.2: Talk

Thursday, March 21, 2024, 15:15–15:30, MA 043

Multi-Probe RF Scanning Tunneling Microscopy in UHV, at Low Temperatures, and in Magnetic Fields — •Jonas Koch, Philipp Lindner, Raluca Boltje, Stefan Krause, and Roland Wiesendanger — Department of Physics, University of Hamburg, Germany

We present a three-tip scanning tunneling microscope designed for multi-probe investigations on the atomic scale. It was developed for the operation in an ultra-high vacuum chamber system [1], at temperatures between 1.5 K and 100 K, and in an external magnetic field of up to 3 T. Three independent scanning units are capable of spin-polarized tunneling with atomic spatial and picosecond time resolution. Ultra-sharp tunneling tips are brought into overlapping scan ranges. One of the potential applications is the localized generation of high-density surface current at low total currents, thereby minimizing harming effects like Joule heating. We will present first proof-of-concept experiments on the example of a local surface current application, along with respective numerical modelling of the electrical current on the sample surface. [1] J. Friedlein et al., Rev. Sci. Instrum. 90, 123705 (2019).

Keywords: MPSTM; Overlapping Scan Ranges; High Current Density; Local Application of Currents; UHV