Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 56: Surface Magnetism I (joint session O/MA)

MA 56.1: Talk

Thursday, March 19, 2020, 15:00–15:15, WIL A317

Magnetic properties of multilayer vanadyl phthalocyanine on Pb(111) — •Piotr Kot, Maximillian Uhl, Robert Drost, and Christian R. Ast — Max Planck Insitute for Solid State Research

Single-molecule magnets have been of great interest to the condensed matter community due to their potential applications in memory storage and quantum computing [1], and their inherent usefulness in studying fundamental quantum mechanics [2]. Here we present a study of vanadyl phthalocyanine (VOPc) molecules which, when deposited in the correct conditions, form multilayer nano-crystals on the surface of Pb(111) with two possible molecular orientations at each layer. Only one of the VOPc orientations on the first layer shows a spin excitation with energy splitting consistent with a spin half system, which agrees with recent findings [3]. The magnetic properties found on the second layer of molecules is also only observed in one of the molecular orientations, and shows strong zero-field splitting. This suggests that the way the first and second layer molecules interact with their environments varies significantly.
1. Leuenberger, Michael N., and Daniel Loss. "Quantum computing in molecular magnets." Nature 410.6830 (2001): 789.
2. Gatteschi, Dante, and Roberta Sessoli. "Quantum tunneling of magnetization and related phenomena in molecular materials." Angewandte Chemie International Edition 42.3 (2003): 268-297.
3. Malavolti, Luigi, et al. "Tunable Spin*Superconductor Coupling of Spin 1/2 Vanadyl Phthalocyanine Molecules." Nano letters 18.12 (2018): 7955-7961.