Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism I (joint session O/MA)

O 110.12: Vortrag

Donnerstag, 19. März 2020, 17:45–18:00, WIL A317

Magnetism of surface-embedded lanthanide single atoms with room temperature structural stability — •Safa Lamia Ahmed1,2, Aparajita Singha1, Denis Krylov1, Stefano Rusponi3, Marina Pivetta3, Christoph Wolf1, Alessandro Lodesani4, Andrea Picone4, Alberto Brambilla4, Alessandro Barla5, Harald Brune3, Andreas Joachim Heinrich1,2, and Fabio Donati1,21Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea — 2Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea — 3Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland — 4Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy — 5Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), I-34149 Trieste, Italy

We investigate surface embedded lanthanide atoms in ultra-thin MgO film on Ag(100) as a potential solution towards realizing single atom magnets [Science 352, 318 (2016)] with room-temperature (RT) structural stability. RT scanning tunneling microscopy images show negligible surface diffusion and nucleation of the embedded atoms. Using X-ray magnetic circular dichroism, we reveal out-of-plane anisotropy for Tm and Sm; in-plane anisotropy for Ho and Dy and negligible anisotropy for Er and Gd. All systems show paramagnetic loops at 2.5 K. Using density functional theory and multiplet calculations, we model the interaction between the 4f electrons and their ligand environment, and determine the atom's magnetic level structure.

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