Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 2: Scanning probe techniques: Method development I

O 2.2: Vortrag

Montag, 12. März 2018, 10:45–11:00, MA 004

A multiprobe scanning tunneling microscope with picosecond time resolution — •Jonas Harm, Johannes Friedlein, Jonas Koch, Maciej Bazarnik, Stefan Krause, and Roland Wiesendanger — Department of Physics, University of Hamburg, Jungiusstraße 11A, 20355 Hamburg, Germany

Here we present a novel design of a 3-tip multiprobe scanning tunneling microscope (MP-STM), which has a picosecond time resolution through the use of RF technology. The microscope consists of two lateral scanners, whose probes are mainly used to contact the sample surface and a central scanner for scanning tunneling microscopy (STM). All three scanners are optimized for their temporal resolution and vibration stability. Using two probes local surface currents can be generated and their effects onto magnetic nanostructures can be investigated on the atomic scale using the central probe tip for spin-polarized STM (SP-STM). Furthermore, the instrument is designed to operate at low temperatures down to 1.5 K and magnetic fields of up to 3 T under UHV conditions. Core concepts of traditional scanning tunneling microscope designs have been combined with novel approaches, such as the use of coaxial RF cabling and connectors. The design concept and first performance tests of the setup under ambient conditions will be presented.