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O: Fachverband Oberflächenphysik
O 99: Spins on surfaces at the atomic scale III
O 99.11: Vortrag
Freitag, 13. März 2026, 12:00–12:15, WILL/A317
Following Spin Interactions into a Chemical Bond Formation — •Dmitriy Borodin1, Merve Ercelik1, Andres Pinar Sole1, Shadi Fatayer2, Harald Brune3, Christoph Wolf1, Franz J. Giessibl4, Fabio Donati1, and Andreas Heinrich1 — 1IBS Center for Quantum Nanoscience, Seoul, South Korea — 2KAUST, Thuwal, Saudi Arabia — 3EPFL, Lausanne, Switzerland — 4University of Regensburg, Regensburg, Germany
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 coexist, ultimately defining the local magnetic structure and phase stability. A particularly interesting interaction occurs between transition metal atoms and rare earth elements, where the nature of magnetic coupling in their alloys remains not fully understood. In this work, we use low-temperature scanning probe microscopy to follow the spin interactions between a tip and an adatom on a surface into a chemical bond. By controlling atom-tip separations on the picometer scale, we continuously tune interaction energies and observe spin pairing between the adatom and the magnetic tip, a situation that is reminiscent of covalent bond formation.
Keywords: Exchange Interaction; Chemical Bonding; 4f elements; Spins; Atomic Force Microscopy