论文标题
铁磁性纳米带的现场驱动并排磁性域壁动力学
Field-driven side-by-side magnetic domain wall dynamics in ferromagnetic nanostrips
论文作者
论文摘要
在磁性纳米带中，已经进行了大量有关域壁动力学的研究，这主要是因为其多功能非线性物理和在数据存储设备中的潜在应用。但是，大多数研究都集中在平面外域壁或面内面对面（尾巴）域壁。在这里，我们在数值上研究了铁磁条中的平面内域壁的现场驱动动力学，在平面内易于轴各向异性方面存在横向到条带的平面易于轴各向异性。域墙在低场处以僵化的方式移动，并在高场上显示复杂的沃克崩溃行为。我们观察到通过宽带涡旋成核的多步沃克分解。在存在Dzyaloshinskii-Moriya相互作用（DMI）的情况下，第一个沃克分解场首先减少，然后随着界面DMI的增加而增加，而随着散装DMI的增加，沃克击球场会增加。这些发现补充了当前对域壁动力学的理解。
There has been a plethora of studies on domain wall dynamics in magnetic nanostrips, mainly because of its versatile non-linear physics and potential applications in data storage devices. However, most of the studies focus on out-of-plane domain walls or in-plane head-to-head (tail-to-tail) domain walls. Here, we numerically study the field-driven dynamics of in-plane side-by-side domain walls in ferromagnetic strips, which can be stable in the presence of an in-plane easy-axis anisotropy transverse to the strip. The domain walls move in a rigid-body manner at low field, and show complex Walker breakdown behavior at high field. We observe a multi-step Walker breakdown through vortex nucleation in wide strips. In the presence of Dzyaloshinskii-Moriya interaction (DMI), the first Walker breakdown field first decreases then increases with interfacial DMI, while keeps increasing with bulk DMI. These findings complement the current understanding on domain wall dynamics.
