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O: Fachverband Oberflächenphysik

O 15: Spins on surfaces at the atomic scale I

O 15.5: Vortrag

Montag, 9. März 2026, 16:15–16:30, WILL/A317

Imaging 2D ferromagnetic order with a single nickelocene molecule — •Leonard Edens¹, Trisha Sai¹, Divya Jyoti¹, Stefano Trivini¹, Fabian Schulz¹, and Nacho Pascual^1,2 — ¹CIC nanoGUNE BRTA, 20018 Donostia - San Sebastián, Spain — ²Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain

Lanthanide intermetallic compounds formed on coinage metal (111) surfaces exhibit ferromagnetic ground states with moments robustly aligned towards a polarization axis, even in the single monolayer limit. Characteristic of these 2D magnetic systems is the intricate dependence of the easy axis on 4f occupancy, and the formation of a moiré-induced superstructure with the support, which causes an inhomogeneous local magnetization [1]. Here, we study two representative alloys of this family of materials, GdAu₂ and TbAu₂, which respectively magnetize in- and out-of-plane. To sense their magnetic state, we employ a single nickelocene molecule adsorbed on the tip of a scanning tunnelling microscope. By quantifying the directional exchange field atom-by-atom, we characterize incommensurate order and local perturbations to the moiré-congruent magnetic texture. Further insight into the nature of the exchange field is gained by studying its dependence on vertical separation and externally applied magnetic fields.

[1] Edens et al. Advanced Materials (2025).
https://doi.org/10.1002/adma.202510753

Keywords: 2D magnetism; nickelocene; scanning tunneling microscopy; rare earth; molecular magnetism