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O: Fachverband Oberflächenphysik

O 51: Poster Wednesday: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy

O 51.1: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Nickelocene molecule as an STM magnetic sensor — •Andrés Pinar Solé, Oleksandr Stetsovych, Shaotang Song, Jiong Liu, Jindrich Kolorenč, and Pavel Jelínek — Czech Institute of Physics, Prague, Czech Republic, Email: pinar@fzu.cz

Functionalization of the scanning probe of a scanning tunnelling microscopy (STM) with metallocene molecule allows performing spin-sensitive measurements on magnetic systems. Here, as a magnetic sensor, we used a nickelocene molecule (NiCp₂) [1][2], consisting of a Ni atom sandwiched between two cyclopentadienyl rings. As an S=1 system, it presents magnetic-induced spectral features due to the inelastic electron spin-flip. Nickelocene functionalized scanning probes were used to probe the magnetism on 1D metallorganic chains and graphene nanoribbons (GNR).

The Nc functionalized probe was also used to measure the magnetism emerging from the unpaired electron on the edge of a wave-like graphene nanoribbon (GNR) on Au(111) [3]. Here, we observed spectral convolution between a Kondo feature from the edge-state and the nickelocene spectrum.

To understand the IETS from the magnetic sensor, a many-body Hubbard model was proposed. It describes the electron tunnelling through the STM tip, the nickelocene, the magnetic center, and the metallic substrate [reference https://arxiv.org/abs/2201.03627]. For this, the system was simplified to a two-site model consisting of the partially filled 3d shell of the nickelocene and a 3d shell in the probed magnetic center (the metal atom on the chain or the edge-state of the GNR).

[1] Ormaza et al., Nano Lett. 2017, 17, 3, 1877-1882, (2016)
[2] Verlhac et al., Science 366, 623-627 (2019)
[3] Shaotang Song et al., Chem. Soc. Rev., 2021, 50, 3238-3262 (2021)