Abstract
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 allows for such control and hence is of major importance. We determine the origin and the strength of the (converse) spin-current DM interaction in the R3c bulk phase of multiferroic BiFeO3 based on density functional theory. Our data support 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 any 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.
| Original language | English |
|---|---|
| Article number | 024403 |
| Journal | Physical Review B |
| Volume | 108 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Jul 2023 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2023 American Physical Society.
Funding
S.M. and B.D. thank Dr. Manuel Bibes and Dr. Eric Bousquet for fruitful discussions and careful reading of the manuscript. This work is supported by the National Natural Science Foundation of China under Grant No. 12074277, the startup fund from Soochow University, and Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions. S.M., M.J.V., B.D., and L.B. acknowledge DARPA Grant No. HR0011727183-D18AP00010 (TEE Program) and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 964931 (TSAR). L.B. also thanks the ARO for Grant No. W911NF-21-1-0113 and the Vannevar Bush Faculty Fellowship (VBFF) Grant No. N00014-20-1-2834 from the Department of Defense. Computing time was provided by ARCHER and ARCHER2 based in the United Kingdom at the National Supercomputing Service with support from PRACE aisbl and from the Consortium d'Equipements de Calcul Intensif (FRS-FNRS Belgium GA 2.5020.11).
| Funders | Funder number |
|---|---|
| TSAR | |
| Vannevar Bush Faculty Fellowship | N00014-20-1-2834 |
| U.S. Department of Defense | |
| United States Army Research Office | W911NF-21-1-0113 |
| Defense Advanced Research Projects Agency | HR0011727183-D18AP00010 |
| National Natural Science Foundation of China | 12074277 |
| Horizon 2020 | 964931 |
| Soochow University | |
| Priority Academic Program Development of Jiangsu Higher Education Institutions |