期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 553, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2022.169264
关键词
Spin wave; Strong Dzyaloshinskii-Moriya interaction; Shock wave
资金
- National Natural Science Foundation of China [11734006, 11974079, 11774064]
- National Key Research and Development Program of China [2016YFA0300703]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- NRF - Korean Government [NRF-2018R1D1A1B07047114]
In this study, we investigated the propagation and emission of spin waves (SWs) in thin film systems with strong interfacial Dzyaloshinskii-Moriya interaction (DMI) using micromagnetic simulation. We found that DMI affects the propagation of SWs in a way analogous to the spin Doppler effect caused by the flow of magnetic medium, and this effect can be enhanced or suppressed by a spin-polarized current. Furthermore, by combining the interfacial DMI and the spin-polarized current, we demonstrated a continuous emission of SWs from a static source, providing a promising approach to generate SWs with tunable frequency.
We investigated spin wave (SW) propagation and emission in thin film systems with strong interfacial Dzyaloshinskii-Moriya interaction (DMI) utilizing micromagnetic simulation. The effect of DMI on SW propagation is analogous to the flow of magnetic medium leading to the spin Doppler effect, and a spin-polarized current can enhance or suppress it. We demonstrate that for a Doppler velocity exceeding a critical value, a shock-wave-like emission of SWs with a cone-shape emerges from a magnetically irregular point as the cone apex. The cone angle is quantitatively determined by the DMI-induced Doppler velocity. Combining the interfacial DMI and the spin-polarized current, a constant SW emission by a static source is demonstrated, which provides a promising route to efficiently generate SWs with tunable frequency.
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