Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.101: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Radio frequency optimized STM for the use with pulsed tunneling voltages — •Christian Saunus, Marco Pratzer, and Markus Morgenstern — II. Physikalisches Institut, RWTH Aachen University, Aachen Germany

The measurement of fast surface dynamics with an STM suffers from the low readout bandwidth given by the high gain preamplifier. To overcome this limit, Sebastian Loth introduced an all electrical pump-probe measurement which enabeled him to measure electron spin relaxation at the order of 100 ns by a commercial standard STM [1]. To increase this time resolution even more we designed a very compact STM with an insitu tip exchange mechanism operating with high frequency voltage pulses. We have shown that a time resolution of 710 ps is achieved by using the non-linearity of the I(V) curve on HOPG. The microscope is designed to work in a 4 K UHV system with 7 T rotatable magnetic field.

[1] S. Loth, Science 329, 1628 (2010)