Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 44: Scanning probe techniques: Method development – Poster

O 44.9: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Iron Implantation from a Ferrocene Ion Source — •Urs Boison, Ajla Karić, Berk Zengin, Lebin Yu, and Fabian D. Natterer — Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland

The scattering of electrons on defects in low dimensional materials provides insight into the electronic structure using quasiparticle interference or tunneling spectroscopy. Since natural defects are mostly spin averaging and obscure magnetic textures, using magnetic impurities would allow a richer inspection of the underlying magnetic properties. At present, magnetic impurities are difficult to produce because chemically active defects are required to chemisorb magnetic atoms, such as hydrogen. We use metal ions in a volatile molecule that can easily and directly be delivered to ion sources commonly used for sample cleaning. Using a conventional sputtering source and heated ferrocene (vapor pressure of 1773 Pa at 400 K), we implant ferrocene molecules between 100 and 3000 eV and use different vapor pressures to investigate the ion implantation efficiency and possible defect generation. We test the optimal dose as a function of these parameters using ion current measurements and mass deposition on a quartz crystal microbalance. To verify successful implantation, we use scanning tunneling microscopy on graphene and superconducting layers. Magnetic defects should exhibit signatures related to Yu-Shiba-Rusinov states, confirming the conservation of their spin upon implantation.

Keywords: Spin polarized scanning tunneling microscopy; Yu-Shiba-Rusinov states; Magnetic impurities; Quasiparticle interference; Ferrocene