Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.56: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Exchange interactions in monolayers of the MnBi2Te4 family — •Donya Mazhjoo, Gustav Bihlmayer, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany
Due to their novel properties, two-dimensional magnetic materials are highly desirable for spintronic applications. An interesting material is MnBi2Te4 [1]. Of substantial interest is the relating of the intrinsically topological properties of MnBi2Te4 and the magnetic interactions and the impact of the alteration of their chemical constitution. The question can be resolved by density functional theory (DFT), which enables the calculation of the magnetic interaction directly from the electronic structure.
By using the full-potential linearized augmented planewave method (FLAPW) as implemented in the Fleur-code [2], we analyzed the exchange interaction in septuple layers of MnBi2Te4 type. Mapping our results on the extended Heisenberg model, we disentangle different exchange interactions, spin-orbit coupling effects like the magnetocrystalline anisotropy, and higher-order interactions [3]. Also, applying an external electric field breaks the inversion symmetry and allows for a strong DMI that may lead to the realization of metastable topological magnetic structures [4].
[1] M. Otrokov et al., Nature 576, 416 (2019).
[2] https://www.flapw.de
[3] M. Hoffmann et al., Phys. Rev. B 101, 024418 (2020).
[4] D. Mazhjoo et al., Proc. SPIE 11470, 114702S (2020).