SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.13: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4
Implementing superconductor/skyrmion-host heterostructures using exfoliated Fe3GeTe2 on NbN — •Maximilian Daschner1,2, Thomas Reindl2, Marion Hagel2, Jürgen Weis2, and Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, UK — 2Max-Planck Institute for Solid State Research, Stuttgart, Germany
Experimental coupling of chiral magnetism and superconductivity through the proximity effect is a challenging and unexplored field that can lead to novel physics. Chiral magnets host topological excitations known as skyrmions that, when coupled to the vortices in a superconductor, are predicted to form Majorana fermions at its boundaries and vortex cores. The van-der-Waals material Fe3GeTe2 is known to host a skyrmion state over temperature and field ranges that depend on the sample thickness. We have exfoliated flakes of Fe3GeTe2 from a high quality crystal grown by vapour transport, deposited them on a NbN film and patterned electrical contacts using standard e-beam lithography techniques. The resulting Hall bar shaped nanodevices provide a convenient system for investigating skyrmion/superconductor interactions: Hall measurements above the superconducting transition temperature Tc3 in combination with magnetic force measurements survey the skyrmion state as a function of applied field, and measurements of the critical current density below Tc3 probe skyrmion-assisted vortex nucleation and pinning.