期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.117202
关键词
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资金
- Nanofabrication Facilities Rossendorf at IBC
- Laboratory for Micro-and Nanotechnology at PSI
- EU Horizon 2020 project MAGicSky [665095]
- National Science Foundation of the USA [EFMA-1641989]
- DARPA
- Center for NanoFerroic Devices (CNFD)
- Nanoelectronics Research Initiative (NRI)
- DFG within Spin +X [SFB/TRR 173]
- European Community [290605]
In the emerging field of magnonics, spin waves are foreseen as signal carriers for future spintronic information processing and communication devices, owing to both the very low power losses and a high device miniaturization potential predicted for short-wavelength spin waves. Yet, the efficient excitation and controlled propagation of nanoscale spin waves remains a severe challenge. Here, we report the observation of high-amplitude, ultrashort dipole-exchange spin waves (down to 80 nm wavelength at 10 GHz frequency) in a ferromagnetic single layer system, coherently excited by the driven dynamics of a spin vortex core. We used time-resolved x-ray microscopy to directly image such propagating spin waves and their excitation over a wide range of frequencies. By further analysis, we found that these waves exhibit a heterosymmetric mode profile, involving regions with anti-Larmor precession sense and purely linear magnetic oscillation. In particular, this mode profile consists of dynamic vortices with laterally alternating helicity, leading to a partial magnetic flux closure over the film thickness, which is explained by a strong and unexpected mode hybridization. This spin-wave phenomenon observed is a general effect inherent to the dynamics of sufficiently thick ferromagnetic single layer films, independent of the specific excitation method employed.
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