SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Spins on Surfaces at the Atomic Scale III
O 33.7: Vortrag
Dienstag, 28. März 2023, 12:15–12:30, REC C 213
Tuning the magnetic anisotropy of two coupled spins in a dinuclear Co(II) complex — Chao Li1, Roberto Robles2, Nicolas Lorente3, Alexander Weismann1, Richard Berndt1, and •Manuel Gruber4 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — 2Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain — 3Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastian, Spain — 4Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany
The magnetic properties of transition-metal ions are often described using a phenomenological spin Hamiltonian, which suggests that S = 1/2 metal ions are isotropic. We investigated a di-nuclear Co(II) complex on Au(111) with low-temperature scanning tunneling microscopy, X-ray magnetic circular dichroism, and density functional theory. The antiferromagnetically coupled Co spins preferentially align along the axis connecting the two Co(II) ions. The magnetic anisotropy is sizable and may be tuned by varying the electronic coupling of the Co(II) ions with the metal electrodes through manipulation of peripheral groups and by approaching the tip toward the complex. These findings may help better describing the magnetic properties of adsorbed molecules, in particular S = 1/2 ions, which are viewed as prototypical systems for quantum operations. Funding from the CRC 1242 is acknowledged.