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Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 99: Spins on surfaces at the atomic scale III

O 99.1: Vortrag

Freitag, 13. März 2026, 09:30–09:45, WILL/A317

Measuring magnetic exchange forces of individual quantum spins — •Nicolaj Betz1,2, Lukas M. Veldman1,2, Milton Aguliar3, Eric Lutz3, Susanne Baumann1, and Sebastian Loth1,21University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany. — 2Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart, Stuttgart, Germany. — 3University of Stuttgart, Institute for Theoretical Physics, Stuttgart, Germany

Dynamics of single atomic spins are governed by interactions with the spins immediate, i.e. atomic scale environment. In that, spin-polarized scanning tunnelling microscopy (STM) can give access to some of these interactions, e.g. those between coupled spins, and it can also be used to detect the dynamics in form of individual spin switches. Atomic force microscopy (AFM) on the other hand, gives access to atomic-scale forces, for example the magnetic exchange interaction [1,2]. Here, we show magnetic exchange force detection on a dynamically switching single Fe atom on MgO/Ag(100). We can tune this spin to undergo a ground state reversal as a function of exchange interaction with the tip. We find that the switching spin interacts strongly with the AFM cantilever. Thus, access to these forces provides a new avenue to study dynamically switching single atomic quantum spins revealing information about the interplay between an atom's interactions and the dynamics of the spin.

[1] N. Hauptmann et al., Nat. Com. 11, 1197 (2020).

[2] U. Kaiser et al. Nature 446, 522-52 (2007).

Keywords: magnetic exchange force; spin dynamics; atomic scale magnetism; scanning probe microscopy

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