SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Spin-Dependent Phenomena in 2D
MA 21.2: Vortrag
Dienstag, 28. März 2023, 15:15–15:30, HSZ 403
Tuning the magnetic interactions in van der Waals Fe3GeTe2 heterostructures — Dongzhe Li1, •Soumyajyoti Haldar2, Tim Drevelow2, and Stefan Heinze2 — 1CEMES, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, F-31055 Toulouse, France — 2Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
We investigate the impact of mechanical strain, stacking order, and external electric fields on the magnetic interactions of a Fe3GeTe2 monolayer deposited on Germanene using density functional theory [1]. We find that an electric field of E= ± 0.5 V/Å applied perpendicular to the Fe3GeTe2/germanene heterostructure leads to significant changes of the exchange constants. We show that the Dzyaloshinskii-Moriya interaction (DMI) in Fe3GeTe2/Germanene is mainly dominated by the nearest neighbors. Furthermore, we demonstrate that the DMI is highly tunable by strain, stacking, and electric field, leading to a large DMI comparable to that of ferromagnetic/heavy metal interfaces. The geometrical change and hybridization effect explain the origin of the high tunability of the DMI at the interface. The magnetocrystalline anisotropy energy (MAE) can also be drastically changed by the application of compressive or tensile strain. The tunability of DMI and MAE by using strain allows the occurrence of nanoscale skyrmions [2].
[1] D. Li, S. Haldar, T. Drevelow, S. Heinze, arXiv:2210.15351.
[2] D. Li, S. Haldar, S. Heinze, Nano Lett. 22, 7706 (2022).