Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 64: Scanning Probe Techniques: Method development

O 64.3: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG3

A dilution refrigerator based UHV spin-polarized STM operating at 30 mK in a vector magnetic fieldHenning von Allwörden1, Andreas Eich1, Jan Hermenau2, Andreas Sonntag2, Jan Gerritsen1, Daniel Wegner1, and •Alexander Ako Khajetoorians11Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Department of Physics, Hamburg University, Hamburg, Germany

Spin-resolved scanning tunnelling microscopy (STM) has advanced as a leading technique to probe the behaviour of single spins down to the level of individual atoms. Nevertheless, a severe limitation in probing spin-dependent phenomena in materials of interest, such as quantum magnets and topological superconductors, is the extremely high energy resolution needed to resolve fine features and minute variations in spectroscopy resulting from interactions. To this end, we advance spin-resolved STM toward the lowest temperatures today, by constructing a microscope that operates in a UHV-based dilution refrigerator capable of a vector magnetic field. Moreover, this new microscope is situated in the new SPIN laboratory, located at the IMM in Nijmegen, which is optimized for ultra-low noise measurements. We present the design of this laboratory, and we illustrate our first benchmark tests at base temperature, as well as the noise characteristics.

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