磁Peierls势中畴壁的运动和扭结的动力学
Motion of domain walls and the dynamics of kinks in the magnetic Peierls potential
摘要：
我们研究了由于晶格的离散性，在Peierls势中磁畴壁的动力学。在磁场的作用下，窄畴壁（与晶格参数相当）的传播通过在其轮廓中形成扭结而进行。我们预测，尽管系统的离散性，这种扭结可以表现得像正弦戈登孤子的薄膜的材料，如钇铁石榴石，我们推导出其他材料的一般条件。在我们的模拟中，我们还观察到了长寿的呼吸者。我们提供的有效质量和极限速度的扭结与我们的数值结果非常吻合的解析表达式。
英文摘要：
We study the dynamics of magnetic domain walls in the Peierls potential due to the discreteness of the crystal lattice. The propagation of a narrow domain wall (comparable to the lattice parameter) under the effect of a magnetic field proceeds through the formation of kinks in its profile. We predict that, despite the discreteness of the system, such kinks can behave like sine-Gordon solitons in thin films of materials such as yttrium iron garnets, and we derive general conditions for other materials. In our simulations we also observe long-lived breathers. We provide analytical expressions for the effective mass and limiting velocity of the kink in excellent agreement with our numerical results.
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