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O: Fachverband Oberflächenphysik
O 118: Surface Magnetism II (joint session O/MA)
O 118.11: Vortrag
Freitag, 20. März 2020, 13:00–13:15, GER 38
Probing the magnetism of single atoms with orbital sensitivity — Aparajita Singha1,2, Daria Sostina1,2, Christoph Wolf1,2, Safa Ahmed1,2, Denis Krylov1,2, Luciano Colazzo1,2, Alessandro Barla3, Pierluigi Gargiani4, Stefano Agrestini4, Woo-suk Noh5, Marina Pivetta6, Stefano Rusponi6, Harald Brune6, Andreas J. Heinrich1,2, and •Fabio Donati1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea — 2Department of Physics, Ewha Womans University, Seoul, Republic of Korea — 3Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), Trieste, Italy — 4ALBA Synchrotron Light Source, Cerdanyola del Vallès, Catalonia, Spain — 5Pohang University of Science and Technology, Pohang, Republic of Korea — 6Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
Individual Ho atoms adsorbed on MgO/Ag(100) show large magnetic anisotropy and long magnetic lifetime up to 40 K [Science 352, 318 (2016)]. Investigating the distribution of the electron spins among the valence orbitals is crucial to understand the quantum level structure and the origin of magnetic stability in these atoms. Here, we use the orbital sensitivity of x-ray absorption spectroscopy to investigate the valence magnetism of rare earth atoms and clusters on MgO/Ag(100). We find both Gd and Ho atoms in a monovalent state, with one electron transferred to the underneath substrate. Combining our findings with density functional theory, we clarify the controversy on the ground state of Ho single atom magnets [Phys. Rev. Lett. 121, 027201 (2018)].