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<p>We analyze the curvature-induced changes in the statics and dynamics of a vortex domain wall (DW) in bent magnetic nanotubes (NTs). Using micromagnetic simulations and analytical calculations in the thin shell approximation, we demonstrate that curvature affects both the profile and the velocity of vortex DWs. In particular, increasing curvature leads to three main effects: domain wall widening, a larger off-surface magnetization component at its center, and higher total magnetic energy. When propagating under an applied magnetic field, the DW velocity increases with curvature. As observed in straight NTs, DW propagation exhibits chiral symmetry breaking characterized by distinct values of the DW velocities depending on the propagation direction along the NT. However, our results evidence that this chiral symmetry breaking is attenuated when the NT is bent due to curvature-induced chiral interactions. Our results highlight bent nanotubes as a promising platform for controlling DW motion through geometric design, opening new avenues for the development of advanced spintronic devices.</p>

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Curvature-induced effects on the vortex domain wall properties in bent nanotubes

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月10日

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  • João V. Nunes,
  • Sebastian Castillo-Sepulveda,
  • José I. Costilla,
  • Sidnei F. de Souza,
  • Rosa M. Corona,
  • Dora Altbir,
  • Vagson L. Carvalho-Santos

摘要

We analyze the curvature-induced changes in the statics and dynamics of a vortex domain wall (DW) in bent magnetic nanotubes (NTs). Using micromagnetic simulations and analytical calculations in the thin shell approximation, we demonstrate that curvature affects both the profile and the velocity of vortex DWs. In particular, increasing curvature leads to three main effects: domain wall widening, a larger off-surface magnetization component at its center, and higher total magnetic energy. When propagating under an applied magnetic field, the DW velocity increases with curvature. As observed in straight NTs, DW propagation exhibits chiral symmetry breaking characterized by distinct values of the DW velocities depending on the propagation direction along the NT. However, our results evidence that this chiral symmetry breaking is attenuated when the NT is bent due to curvature-induced chiral interactions. Our results highlight bent nanotubes as a promising platform for controlling DW motion through geometric design, opening new avenues for the development of advanced spintronic devices.