Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 80: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 3

O 80.3: Talk

Friday, September 9, 2022, 11:00–11:15, S051

indirect spin-readout of rare-earth-based single-molecule magnet with STM — •hongyan chen¹, timo frauhammer¹, timofey balashov², gabriel derenbach^1,3, svetlana klyatskaya⁴, eufemio moreno-pineda⁵, mario ruben^3,4,6, and wulf wulfhekel^1,3 — ¹Physikalisches Institut, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — ²Physikalisches Institut, RWTH Aachen, 52074 Aachen, Germany — ³Institute for Quantum Materials and Technologies, KIT, 76021 Karlsruhe, Germany — ⁴Institute of Nanotechnology, KIT, 76021 Karlsruhe, Germany — ⁵Departamento de Química-Física, Escuela de Química, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá 0824, Panama — ⁶Centre Européen de Sciences Quantiques (CESQ) in the Institut de Science et d’Ingénierie Supramoléculaires (ISIS), 8 allée Gaspard Monge BP 70028, 67083 Strasbourg Cedex, France

Rare-earth based SMMs are promising candidates for magnetic information storage as their large magnetic moments are carried by localized 4f electrons. However, this in turn hampers a direct readout of the moment. Here, we present the indirect readout of the Dy moment in DyPc₂ molecules on Au(111) using mK-STM. Because of an unpaired electron on the Pc ligand, the molecules show a Kondo resonance that is, however, split by the ferromagnetic exchange interaction between the unpaired electron and the Dy spin. Using spin-polarized STS, we read out the Dy spin as a function of the applied magnetic field, exploiting the spin polarization of the exchange-split Kondo state.