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O: Fachverband Oberflächenphysik

O 24: Poster Scanning Probe Techniques: Method Development

O 24.10: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Implementation of radio-frequency magnetic fields for electron spin resonance atomic force microscopy — •Raffael Spachtholz, Lisanne Sellies, Franziska Bruckmann, Sonja Bleher, Philipp Scheuerer, and Jascha Repp — Department of Physics, Universität Regensburg

Implementing electron spin resonance in scanning tunneling microscopy represents a milestone in controlling spin systems at atomic scales [1]. In this emerging research field the required radio-frequency (RF) signal is provided as an electric field, translating to an effective magnetic field.

Here we report the integration of a radio-frequency (RF) magnetic field, in the frequency range of 0.1 to 3 GHz, into a scanning-probe microscope. We utilized a flexible polyimide printed-circuit-board coil to generate the RF magnetic fields. Additionally, an insulating sample, coated with a gold microstructure, was designed to locally enhance the RF magnetic field while mitigating the screening effects caused by a metallic substrate. Up to 3 GHz the transmission only moderately depends on frequency and exhibits no sharp resonances. This development enabled the implementation of electron spin resonance in atomic force microscopy, as demonstrated for individual pentacene molecules [2].

[1] S. Baumann, et al., Science 350, 417-420 (2015)

[2] L. Sellies, et al., Nature 624, 64-68 (2023)

Keywords: atomic force microscopy; electron spin resonance; single molecules; scanning tunneling microscopy; ultra high vaccuum