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 Plucinski¹ — ¹PGI-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)