Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Spins on Surfaces at the Atomic Scale II

O 90.4: Vortrag

Donnerstag, 20. März 2025, 15:45–16:00, H11

Spin interactions at the periphery between atomic and condensed-matter physics — •Dmitriy Borodin, Andrés Pinar Solé, Merve Ercelik, and Andreas J. Heinrich — IBS Center for Quantum Nanoscience, Seoul, South Korea

Exchange interactions are essential for the formation of chemical bonds between atoms and dictate the electronic structure of molecules. In a condensed-matter system, a manifold of exchange mechanisms coexists, ultimately defining the local magnetic structure and phase stability. In this work, we use low-temperature scanning probe microscopy to investigate the exchange mechanisms and interaction energies between atoms on surfaces and magnetic tips. By controlling the atom-tip separations on a picometer scale, we can continuously tune the interaction energies and observe changes in the local magnetic structure of the tip. Furthermore, we explore the impact of the elemental composition of magnetic tips on their exchange interactions with surface-bound atoms and identify experimental strategies to adjust the sign and strength of these interactions.

Keywords: Scanning Probe Microscopy; Exchange Interactions; Spin; Atoms; Magnetism