Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Poster Focus Session Atomic Scale Investigation of Magnetic 2D Materials
O 76.3: Poster
Mittwoch, 19. März 2025, 18:00–20:00, P2
The Nickelocene as an STM Atomic-Spin Sensor via cotunnelling theory — •Andres Pinar Sole1,2, Manish Kumar1, Diego Soler-Polo1, Oleksandr Stetsovych1, and Pavel Jelinek1 — 1Czech Institute of Physics, Cukrovarnicka 10, Prague 6, 16200 (Czech Republic) — 2Center for Quantum Nanoscience (QNS) Research Cooperation Building Ewha Womans University, 03760 Seoul, (Republic of Korea)
Functionalization of a scanning microscopy probe with a single nickelocene attached to the tip allows reproducible spin-sensitive measurements of magnetic systems on surfaces. As a S=1 molecule, the triplet ground state of the nickelocene tip gives rise to a inelastic electron spin-flip excitation which changes upon interactions with spin systems on the surface. Some advantages of nickelocene functionalization compared to spin-polarized tips include tip passivation, enabling data acquisition at close tip-sample distances and well defined spin and tip apex. These features enable us to determine the local spin moment on the surface with atomic-scale precision.
While the interactions between the nickelocene spin and the magnetic centers has been modelled using a two-site Heisenberg Hamiltonian, we complement it to include the tunnelling current as an electronic transport phenomenon via cotunneling theory. It allows understanding the absence of transitions that are not allowed according to the selection rules or have relatively weaker intensity. We cover S = 1/2, 1, and 3/2 systems, as well as 2D magnetic materials and compare the simulations with experimental results.
Keywords: stm; quantum magnetism; tip functionalization; spin; cotunneling theory