磁性纳米带中横畴壁传播过程中反涡旋的产生、增长和消亡
Birth, Growth and Death of an Antivortex during the Propagation of a Transverse Domain Wall in Magnetic Nanostrips
摘要：
观察和分析了由于横向畴壁（DW）在磁性纳米带中的传播而引起的反涡旋的产生、生长和死亡。反涡旋的形成是由静磁相互作用产生的草莓状横向涡旋的内禀过程。在外部磁场下，宽度较宽区域中的DW倾向于比较窄部分中的DW移动得更快。这种速度不匹配倾斜并拉长了DW中心线。在DW中心线的尾部附近周期性地产生一个反涡。反涡要么沿着中心线移动并在带材的另一侧死亡，要么增长到其最大尺寸，从DW中分离出来，并最终消失。前一种路由使DW的极性反转，而后一种路由保持DW的极性不变。DW结构的演变进行了分析，使用绕组数分配给每个拓扑缺陷。得到了场宽平面上的相图并进行了讨论。
英文摘要：
Antivortex birth, growth and death due to the propagation of a transverse domain wall (DW) in magnetic nanostrips are observed and analyzed. Antivortex formation is an intrinsic process of a strawberry-like transverse DW originated from magnetostatic interaction. Under an external magnetic field, DW in a wider width region tends to move faster than that of a narrower part. This speed mismatch tilts and elongates DW centre line. An antivortex is periodically born near the tail of the DW centre line. The antivortex either moves along the centre line and dies on the other side of the strip, or grows to its maximum size, detaches itself from the DW, and vanishes eventually. The former route reverses the polarity of DW while the later keeps the DW polarity unchanged. The evolution of the DW structures is analyzed using winding numbers assigned to each topological defects. The phase diagram in the field-width plane is obtained and discussed.
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