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Chin. Phys. B, 2020, Vol. 29(7): 077502    DOI: 10.1088/1674-1056/ab90e5
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Spin waves and transverse domain walls driven by spin waves: Role of damping

Zi-Xiang Zhao(赵梓翔)1, Peng-Bin He(贺鹏斌)1, Meng-Qiu Cai(蔡孟秋)1, Zai-Dong Li(李再东)2,3,4
1 School of Physics and Electronics, Hunan University, Changsha 410082, China;
2 School of Science, Tianjin University of Technology, Tianjin 300384, China;
3 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China;
4 Department of Applied Physics, Hebei University of Technology, Tianjin 300401, China
Abstract  Based on the uniform, helical and spiral domain-wall magnetic configurations, the excited spin waves are studied with emphasis on the role of damping. We find that the damping closes the gap of dispersion, and greatly influences the dispersion in the long-wave region for the spin waves of spiral wall and helical structure. For the uniform configuration, the Dzyaloshinskii-Moriya interaction determines the modification of dispersion by the damping. Furthermore, we investigate the interaction between spin waves and a moving spiral domain wall. In the presence of damping, the amplitude of spin wave can increase after running across the wall for small wave numbers. Driving by the spin waves, the wall propagates towards the spin-wave source with an increasing velocity. Unlike the case without damping, the relation between the wall velocity and the spin-wave frequency depends on the position of wall.
Keywords:  spin waves      domain walls      helical magnetic structure      collective coordinates  
Received:  20 April 2020      Revised:  20 April 2020      Published:  05 July 2020
PACS:  75.30.Ds (Spin waves)  
  75.60.Ch (Domain walls and domain structure)  
  75.10.Hk (Classical spin models)  
  75.78.-n (Magnetization dynamics)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61774001 and 51972103), the Natural Science Foundation of Hebei Province of China (Grant No. F2019202141), and the Fund of the State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, China (Grant No. KF201906).
Corresponding Authors:  Peng-Bin He     E-mail:  hepengbin@hnu.edu.cn

Cite this article: 

Zi-Xiang Zhao(赵梓翔), Peng-Bin He(贺鹏斌), Meng-Qiu Cai(蔡孟秋), Zai-Dong Li(李再东) Spin waves and transverse domain walls driven by spin waves: Role of damping 2020 Chin. Phys. B 29 077502

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