Regensburg 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 64: Focus Session Atomic Scale Investigation of Magnetic 2D Materials

O 64.7: Talk

Wednesday, March 19, 2025, 17:30–17:45, H2

Conflicting magnetic anisotropy in 2D metal-organic networks — •Diego Radillo^1,2, Céline Hensky^1,2, Quy Hien Le^1,2, Manfred Parschau³, Egzona Isufi Neziri³, Christian Wäckerlin^1,2, and Pierluigi Gargiani⁴ — ¹EPFL, Switzerland — ²PSI, Switzerland — ³Empa, Switzerland — ⁴ALBA, Spain

This talk presents insights into the properties of 2D metal-organic coordination networks embedded with atoms of conflicting magnetic anisotropies. In particular, we look into the coordination networks of tetracyanoethylene with Ni atoms (NiTCNE), Fe atoms (FeTCNE) and a mixture of both (NiFeTCNE), on a gold(111) surface. NiTCNE is known to be a ferromagnet with an out-of-plane easy axis of magne- tization. Whereas, for the conflicting in-plane ferromagnet, we propose FeTCNE as a suitable candidate. In our mixed-network experiments, where the magnetic exchange energy enforces that the preferences of the two metal ions cannot be perfectly satisfied, we observe that the magnetization along the out-of-plane and in-plane axes at the Ni and Fe centers mutually influence each other in a rather rational way. This interaction suggests the potential for fine-tuning the magnetization axis and highlights the importance of investigating spin alignment at the per-atom scale. Scanning probe microscopy (SPM) and non-contact atomic force microscopy (AFM) are employed to inspect the morphology of the networks, while X-ray absorption spectroscopy (XAS) and X-ray mag- netic circular dichroism (XMCD) were utilized to analyze the magnetic properties.

Keywords: Metal-organic; Network; Magnetism; Anisotropy