中国物理B ›› 2020, Vol. 29 ›› Issue (9): 97502-097502.doi: 10.1088/1674-1056/aba09a

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Asymmetric dynamic behaviors of magnetic domain wall in trapezoid-cross-section nanostrip

Xiao-Ping Ma(马晓萍), Hong-Guang Piao(朴红光), Lei Yang(杨磊), Dong-Hyun Kim, Chun-Yeol You, Liqing Pan(潘礼庆)   

  1. 1 Research Institute for Magnetoelectric & Weak Magnetic-field Detection, College of Science, China Three Gorges University, Yichang 443002, China;
    2 Department of Physics, Chungbuk National University, Cheongju 28644, Chungbuk, Republic of Korea;
    3 Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology(DGIST), Daegu 42988, Republic of Korea
  • 收稿日期:2020-03-27 修回日期:2020-06-01 接受日期:2020-06-29 出版日期:2020-09-05 发布日期:2020-09-05
  • 通讯作者: Hong-Guang Piao E-mail:hgpiao@ctgu.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant Nos. 2017YFB0903700 and 2017YFB0903702), Yichang Government Fund (Grant No. A19-402-a05), the Korea Research Foundation (NRF) (Grant No. 2018R1A2B3009569), and Korea Basic Science Institute (KBSI) (Grant No. D39614).

Asymmetric dynamic behaviors of magnetic domain wall in trapezoid-cross-section nanostrip

Xiao-Ping Ma(马晓萍)1, Hong-Guang Piao(朴红光)1, Lei Yang(杨磊)1, Dong-Hyun Kim2, Chun-Yeol You3, Liqing Pan(潘礼庆)1   

  1. 1 Research Institute for Magnetoelectric & Weak Magnetic-field Detection, College of Science, China Three Gorges University, Yichang 443002, China;
    2 Department of Physics, Chungbuk National University, Cheongju 28644, Chungbuk, Republic of Korea;
    3 Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology(DGIST), Daegu 42988, Republic of Korea
  • Received:2020-03-27 Revised:2020-06-01 Accepted:2020-06-29 Online:2020-09-05 Published:2020-09-05
  • Contact: Hong-Guang Piao E-mail:hgpiao@ctgu.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant Nos. 2017YFB0903700 and 2017YFB0903702), Yichang Government Fund (Grant No. A19-402-a05), the Korea Research Foundation (NRF) (Grant No. 2018R1A2B3009569), and Korea Basic Science Institute (KBSI) (Grant No. D39614).

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摘要： Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes.

关键词: ferromagnetic nanowire, magnetic domain wall, geometric effect, asymmetric Walker breakdown

Abstract: Field-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes.

Key words: ferromagnetic nanowire, magnetic domain wall, geometric effect, asymmetric Walker breakdown

中图分类号:  (Magnetic properties of nanostructures)

  • 75.75.-c
75.78.-n (Magnetization dynamics) 75.78.Cd (Micromagnetic simulations ?) 75.78.Fg (Dynamics of domain structures)