SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Molecular Magnetism I
MA 19.1: Vortrag
Dienstag, 28. März 2023, 15:00–15:15, HSZ 04
Molecular orientation of Er(III) cyclooctatetraene-based single-molecule magnets on Ag(100) — •Vladyslav Romankov1, Niéli Daffé1, Diana Vaclavkova1, Martin Heinrich1, Matthias Muntwiler1, Bernard Delley1, Katie Harriman2, Muralee Murugesu2, Moritz Bernhardt3, Maciej Korzyński3, Christophe Copéret3, and Jan Dreiser1 — 1PSI, Switzerland — 2uOttawa, Canada — 3ETH Zurich, Switzerland
Recently, organometallic lanthanide-(III)-based single-molecule magnets (SMMs) have shown outstanding magnetic properties up to liquid nitrogen temperature [1]. SMMs with planar ligands, like COT2− (cyclooctatetraene anion) and Cp*− (pentamethylcyclopentadienide), are good candidates to form ordered monolayers, but the packing and the molecule-substrate interaction play a vital role in the properties of such molecules when deposited on metal surfaces [2]. In the present work we show how two similar Er(III) SMMs, K[Er(COT)2] and Cp*ErCOT, order very differently on Ag(100). In particular, X-ray linear and magnetic circular dichroism measurements show that the easy axis of K[Er(COT)2] aligns parallel to the surface, while that of Cp*ErCOT SMMs is consistent with a mixed standing-lying phase. Indeed, low-temperature scanning tunneling microscopy reveals that Cp*ErCOT forms alternating rows of standing-up and lying-down molecules, while X-ray photoemission spectroscopy reveals the integrity of both the SMMs and suggests a weak molecule-surface interaction.
References: [1] F. S. Guo et al., Science, 362, 1400, (2018); [2] C. Wäckerlin et al., Advanced Materials, 28, 5142, (2016).