SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Functional Antiferromagnetism I
MA 18.7: Vortrag
Dienstag, 28. März 2023, 16:45–17:00, HSZ 02
Spin-current driven Dzyaloshinskii-Moriya interaction in the multiferroic BiFeO3 from first-principles — •Sebastian Meyer1, Bin Xu2,3, Matthieu J. Verstraete1, Laurent Bellaiche3, and Bertrand Dupé1,4 — 1Université de Liège, Belgium — 2Soochow University, China — 3University of Arkansas, USA — 4Fonds de la Recherche Scientifique (FRS-FNRS), Belgium
The electrical control of magnons opens up new ways to transport and process information for logic devices. In magnetoelectrical multiferroics, the Dzyaloshinskii-Moriya (DM) interaction directly allow for such a control and, hence, is of major importance [1]. We determine the origin and strength of the (converse) spin current DM interaction [2,3] in the R3c bulk phase of the multiferroic BiFeO3 based on density functional theory. Our data supports only the existence of one DM interaction contribution originating from the spin current model. By exploring the magnon dispersion in the full Brillouin Zone, we show that the exchange is isotropic, but the DM interaction and anisotropy prefer any propagation and magnetization direction within the full (111) plane. Our work emphasizes the significance of the asymmetric potential induced by the spin current over the structural asymmetry induced by the anionic octahedron in multiferroics such as BiFeO3.
[1] P. Rovillain, et. al., Nature Materials 9, 975 (2010)
[2] H. Katsura, et. al., Phys. Rev. Lett. 95, 057205 (2005)
[3] D. Rahmedov, et. al., Phys. Rev. Lett. 109, 037207 (2012)