Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 46: Magnetic Imaging Techniques II

MA 46.5: Talk

Thursday, March 12, 2026, 10:30–10:45, POT/0361

Magnetic interactions and magnetic field distributions in van der Waals heterostructures with Fe₃GeTe₂ — •Joachim Dahl Thomsen¹, Qianqian Lan¹, Eva Duft¹, Zdeněk Sofer², Nikolai Kiselev³, and Rafal Dunin-Borkowski¹ — ¹Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Jülich, Germany — ²Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Prague, Czech Republic — ³Peter Grünberg Institute and Institute for Advanced Simulations, Forschungszentrum Jülich, Jülich, Germany

Magnetic van der Waals (vdW) materials are promising for memory and logic applications because their properties are highly tunable and they integrate readily into heterostructures that exploit proximity and interlayer effects. However, depth-resolved imaging of interlayer coupling is challenging in plan-view, where contrast is integrated through the sample. Here we use cross-sectional Fe₃GeTe₂ (FGT)/graphite/FGT heterostructures to probe coupling between vertically stacked FGT layers across separations of 0-110 nm. We use Lorentz TEM and off-axis electron holography to visualize the domain structure and map the magnetic field inside and outside the vdW heterostructures, resolving how the interaction evolves with spacer (graphite) thickness. We find that domain alignment between FGT flakes is set by their separation, and that a weak interaction persists even at a separation of 110 nm. These measurements provide design guidance for vdW heterostructure devices that rely on controlled interlayer interactions between magnetic textures.

Keywords: Van der Waals ferromagnets; Van der Waals heterostructures; Transmission electron microscopy; Lorentz TEM; Electron holography