Dynamic Symmetry Breaking in Chiral Magnetic Systems
[1];
- University of California, San Diego, CA (United States); OSTI
- Carnegie Mellon University, Pittsburgh, PA (United States)
- University of California, San Diego, CA (United States); Universite de Lorraine, Champenoux (France)
- University of California, San Diego, CA (United States)
- University of Colorado, Boulder, CO (United States)
- Universite de Lorraine, Champenoux (France)
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 Néel-type domain walls (DWs) whose energetics and mobility remain at issue. Thus, a new effect is characterized 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. The authors 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 Néel-type DWs and expands the utility of field-driven DW motion to probe and control chiral DWs.
- Research Organization:
- University of California, San Diego, CA (United States)
- Sponsoring Organization:
- Defense Advanced Research Agency (DARPA); National GEM Consortium; Neil and Jo Bushnell Fellowship; USDOE; USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0018237; SC0019273
- OSTI ID:
- 1976193
- Journal Information:
- Advanced Materials, Journal Name: Advanced Materials Journal Issue: 39 Vol. 33; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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