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.
作者
Xiao-Ping Ma
Hong-Guang Piao
Lei Yang
Dong-Hyun Kim
Chun-Yeol You
Liqing Pan
马晓萍;朴红光;杨磊;Dong-Hyun Kim;Chun-Yeol You;潘礼庆(Research Institute for Magnetoelectric&Weak Magnetic-field Detection,College of Science,China Three Gorges University,Yichang 443002,China;Department of Physics,Chungbuk National University,Cheongju 28644,Chungbuk,Republic of Korea;Department of Emerging Materials Science,Daegu Gyeongbuk Institute of Science and Technology(DGIST),Daegu 42988,Republic of Korea)
基金
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)
Korea Basic Science Institute(KBSI)(Grant No.D39614).
