期刊
ADVANCED MATERIALS
卷 33, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101524
关键词
chiral domain walls; Dzyaloshinskii-Moriya interactions; magnetic thin films
类别
资金
- QMEEN-C Energy Frontier Research Center - US Department of Energy, Office of Science [DE-SC0018237]
- Defense Advanced Research Projects Agency (DARPA) program on Topological Excitations in Electronics (TEE) [D18AP00011]
- National GEM Consortium
- Neil and Jo Bushnell Fellowship in Engineering from the College of Engineering at Carnegie Mellon University
- US Department of Energy, Office of Science [DE-SC0018237]
- [MCF-677785]
- U.S. Department of Energy (DOE) [DE-SC0018237] Funding Source: U.S. Department of Energy (DOE)
A new effect is discovered where 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. 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 experimental findings.
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 Neel-type domain walls (DWs) whose energetics and mobility remain at issue. Here, 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 Neel-type DWs and expands the utility of field-driven DW motion to probe and control chiral DWs.
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