Dynamic Symmetry Breaking in Chiral Magnetic Systems
| Autor: | Jeffrey A. Brock, Eric E. Fullerton, Michael D. Kitcher, Grant Riley, Rajasekhar Medapalli, Maxwell Li, Pierre Vallobra, Marc De Graef, Vincent Sokalski, Stéphane Mangin, Hans T. Nembach |
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| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Condensed matter physics Field (physics) Mechanical Engineering media_common.quotation_subject Elastic energy Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Field strength Asymmetry Magnetic field Magnetization Ferromagnetism Mechanics of Materials Condensed Matter::Strongly Correlated Electrons General Materials Science Symmetry breaking media_common |
| Zdroj: | Advanced materials (Deerfield Beach, Fla.). 33(39) |
| ISSN: | 1521-4095 |
| Popis: | The Dzyaloshinskii-Moriya interaction (DMI) in magnetic systems stabilizes spin textures with preferred chirality, applicable to next-generation memory and computing architectures. In perpendicularly magnetized heavy-metal/ferromagnet films, the interfacial DMI originating from structural inversion asymmetry and strong spin-orbit coupling favors chiral N\'eel-type domain walls (DWs) whose energetics and mobility remain at issue. Here, we characterize a new effect in which domains expand unidirectionally in response to a combination of out-of-plane and in-plane magnetic fields, with the growth direction controlled by the in-plane field strength. These growth directionalities and symmetries with applied fields cannot be understood from static treatments alone. We theoretically demonstrate that perpendicular field torques stabilize steady-state magnetization profiles highly asymmetric in elastic energy, resulting in a dynamic symmetry breaking consistent with the experimental findings. This phenomenon sheds light on the mechanisms governing the dynamics of N\'eel-type DWs and expands the utility of field-driven DW motion to probe and control chiral DWs. Comment: 20 pages, 4 figures, 10 supplementary figures |
| Databáze: | OpenAIRE |
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