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Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.55: Poster

Tuesday, September 6, 2022, 17:30–20:00, P2

Domain structure of few-layer Fe3GeTe2 microflakes — •Honey Boban1, Keda Jin2, Tobias Wichmann2, Anna Mandziak3, Ewa Madej3, Jose Martinez Castro2, Vitaliy Feyer4, Iulia Cojocariu4, Daniel Baranowski4, Felix Lupke2, Claus Michael Schneider1, and Lukasz Plucinski11PGI-6, Forschungszentrum Juelich — 2PGI-3, Forschungszentrum Juelich — 3SOLARIS Centre, Krakow — 4Elettra Synchrotron, Trieste

Fe3GeTe2 is a ferromagnetic 2D metal with a bulk transition temperature of 220K[1]. Monolayer FGT is inversion asymmetric, whereas in the bulk inversion symmetry is recovered because of the AB stacking. FGT exhibits stripe domain patterns with an average width of 140 nm at 110K[1]. Within each layer a combination of inversion asymmetry with ferromagnetism gives rise not only to a finite spin polarization but also to energy shifts of spectral features between K and K’ momenta[2].

To study the spin polarized bands in FGT, we shall probe a single terrace with domain larger than the photon beamspot. We exfoliated FGT flakes of 4-5 monolayer thickness on graphite/Au/SiO2 in a glovebox and encapsulated them with graphene, since thin FGT flakes degrade rapidly in ambient conditions[3]. Dichroic PEEM measurements on these flakes showed single domains of sizes up to 4 x 3 µm, when cooled down to <100K. The thin flakes with 4 x 3 µm single domain can be used to demonstrate the predicted asymmetries at the K and K’ points.

[1] Nano Lett. 18, 5974(2018), [2] Nature Physics 10, 387(2014), [3] npj 2D Materials and Applications 4, 33(2020)

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