Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Molecular Magnetism
MA 34.7: Vortrag
Donnerstag, 20. März 2025, 11:15–11:30, H18
Cooperative and Selective Redox Doping Switches Single-Molecule Magnetism — Fabian Paschke1, Matteo Briganti2, Vivien Enenkel1, Tobias Birk1, Jan Dreiser3, Peter Schmitt4, Rainer F. Winter4, Federico Totti2, and •Mikhail Fonin1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Department of Chemistry ’Ugo Schiff’ and INSTM Research Unit, University of Florence, 50019 Sesto Fiorentino, Italy — 3Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland — 4Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany
The controlled manipulation of electronic and magnetic states in single-molecule magnets (SMMs) is crucial for their implementation in molecular spintronics. In typical SMMs, key properties like magnetic anisotropy and slow magnetic relaxation are imposed by complex ligand shells, whose bulky and three-dimensional structures hamper efficient manipulation of the molecular magnetism by chemical methods. Here, we demonstrate highly selective chemical doping of an Fe4 nanomagnet on a Pb(111) surface using lithium atoms. Scanning tunneling microscopy, X-ray absorption spectroscopy, and ab initio calculations reveal the cooperative incorporation of three Li atoms per Fe4 molecule, resulting in a selective, threefold reduction of its iron-based magnetic core. The doping modifies the intramolecular exchange interaction, turning from antiferromagnetic to ferromagnetic coupling, and changes the molecular magnetic anisotropy from easy-axis to easy-plane.
Keywords: single molecular magnets; scanning tunneling microscopy