中国物理B ›› 2023, Vol. 32 ›› Issue (11): 117503-117503.doi: 10.1088/1674-1056/acd327

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In-plane spin excitation of skyrmion bags

Shuang Li(李爽)1, Ke-Xin Li(李可欣)1, Zhao-Hua Liu(刘照华)1, Qi-Yuan Zhu(朱起源)2, Chen-Bo Zhao(赵晨博)3, Hu Zhang(张虎)1, Xing-Qiang Shi(石兴强)1, Jiang-Long Wang(王江龙)1, Rui-Ning Wang(王瑞宁)1, Ru-Qian Lian(连如乾)1, Peng-Lai Gong(巩朋来)1, and Chen-Dong Jin(金晨东)1,†   

  1. 1 Key Laboratory of Optic-Electronic Information and Materials of Hebei Province, Research Center for Computational Physics, College of Physics Science and Technology, Hebei University, Baoding 071002, China;
    2 College of Mathematics and Physics, Chongqing University of Science and Technology, Chongqing 401331, China;
    3 Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • 收稿日期:2023-02-24 修回日期:2023-05-05 接受日期:2023-05-06 出版日期:2023-10-16 发布日期:2023-10-24
  • 通讯作者: Chen-Dong Jin E-mail:jinchd@hbu.edu
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12104124 and 12274111), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2021201001 and A2021201008), the Central Guidance Fund on the Local Science and Technology Development of Hebei Province, China (Grant No. 236Z0601G), the Post-graduate’s Innovation Fund Project of Hebei Province, China (Grant No. CXZZSS2023007), the Advanced Talents Incubation Program of the Hebei University, China (Grant Nos. 521000981395, 521000981423, 521000981394, and 521000981390), the Research Foundation of Chongqing University of Science and technology, China (Grant No. ckrc2019017), and the High-Performance Computing Center of Hebei University, China.

In-plane spin excitation of skyrmion bags

Shuang Li(李爽)1, Ke-Xin Li(李可欣)1, Zhao-Hua Liu(刘照华)1, Qi-Yuan Zhu(朱起源)2, Chen-Bo Zhao(赵晨博)3, Hu Zhang(张虎)1, Xing-Qiang Shi(石兴强)1, Jiang-Long Wang(王江龙)1, Rui-Ning Wang(王瑞宁)1, Ru-Qian Lian(连如乾)1, Peng-Lai Gong(巩朋来)1, and Chen-Dong Jin(金晨东)1,†   

  1. 1 Key Laboratory of Optic-Electronic Information and Materials of Hebei Province, Research Center for Computational Physics, College of Physics Science and Technology, Hebei University, Baoding 071002, China;
    2 College of Mathematics and Physics, Chongqing University of Science and Technology, Chongqing 401331, China;
    3 Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2023-02-24 Revised:2023-05-05 Accepted:2023-05-06 Online:2023-10-16 Published:2023-10-24
  • Contact: Chen-Dong Jin E-mail:jinchd@hbu.edu
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12104124 and 12274111), the Natural Science Foundation of Hebei Province, China (Grant Nos. A2021201001 and A2021201008), the Central Guidance Fund on the Local Science and Technology Development of Hebei Province, China (Grant No. 236Z0601G), the Post-graduate’s Innovation Fund Project of Hebei Province, China (Grant No. CXZZSS2023007), the Advanced Talents Incubation Program of the Hebei University, China (Grant Nos. 521000981395, 521000981423, 521000981394, and 521000981390), the Research Foundation of Chongqing University of Science and technology, China (Grant No. ckrc2019017), and the High-Performance Computing Center of Hebei University, China.

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摘要： Skyrmion bags are spin structures with arbitrary topological charges, each of which is composed of a big skyrmion and several small skyrmions. In this work, by using an in-plane alternating current (AC) magnetic field, we investigate the spin-wave modes of skyrmion bags, which behave differently from the clockwise (CW) rotation mode and the counterclockwise (CCW) rotation mode of skyrmions because of their complex spin topological structures. The in-plane excitation power spectral density shows that each skyrmion bag possesses four resonance frequencies. By further studying the spin dynamics of a skyrmion bag at each resonance frequency, the four spin-wave modes, i.e., a CCW-CW mode, two CW-breathing modes with different resonance strengths, and an inner CCW mode, appear as a composition mode of outer skyrmion-inner skyrmions. Our results are helpful in understanding the in-plane spin excitation of skyrmion bags, which may contribute to the characterization and detection of skyrmion bags, as well as the applications in logic devices.

关键词: skyrmion bags, spin-wave mode, power spectral density, micromagnetic simulation

Abstract: Skyrmion bags are spin structures with arbitrary topological charges, each of which is composed of a big skyrmion and several small skyrmions. In this work, by using an in-plane alternating current (AC) magnetic field, we investigate the spin-wave modes of skyrmion bags, which behave differently from the clockwise (CW) rotation mode and the counterclockwise (CCW) rotation mode of skyrmions because of their complex spin topological structures. The in-plane excitation power spectral density shows that each skyrmion bag possesses four resonance frequencies. By further studying the spin dynamics of a skyrmion bag at each resonance frequency, the four spin-wave modes, i.e., a CCW-CW mode, two CW-breathing modes with different resonance strengths, and an inner CCW mode, appear as a composition mode of outer skyrmion-inner skyrmions. Our results are helpful in understanding the in-plane spin excitation of skyrmion bags, which may contribute to the characterization and detection of skyrmion bags, as well as the applications in logic devices.

Key words: skyrmion bags, spin-wave mode, power spectral density, micromagnetic simulation

中图分类号:  (Magnetic properties of nanostructures)

  • 75.75.-c
75.75.Jn (Dynamics of magnetic nanoparticles) 75.78.Cd (Micromagnetic simulations ?) 12.39.Dc (Skyrmions)