论文标题
沃克般的域壁故障在由交错的旋转轨道驱动的分层抗铁磁体中
Walker-like Domain Wall breakdown in layered Antiferromagnets driven by staggered spin-orbit fields
论文作者
论文摘要
在线性连续理论中，没有任何磁纹理可以比其自旋波的最大组速度更快地传播。在这里，我们报告了由于出现其他抗铁磁纹理的出现而报告的瞬态状态，该纹理通过原子自旋动力学模拟破坏了磁系统的Lorentz翻译不变性。这种动态状态类似于铁磁体中的域壁沃克破裂，涉及抗铁磁域壁对的成核。随后，一个成核的180 $^{\ circ} $域墙之一是用原始域壁a 360 $^{\ circ} $旋转旋转而创建的，即使在旋转轨道的作用下，它仍然保持静态。另一个180 $^{\ circ} $域墙会加速到超磁通速度。在大型自旋轨道场下，获得了多个结构域壁的产生和重组，这可能解释了最近在实验中观察到的当前脉冲会诱导大域结构粉碎成小的碎片域，并随后慢速复兴大规模域形成先前的电流脉冲。
Within linear continuum theory, no magnetic texture can propagate faster than the maximum group velocity of its spin waves. Here we report a transient regime due to the appearance of additional antiferromagnetic textures that breaks the Lorentz translational invariance of the magnetic system by atomistic spin dynamics simulations. This dynamical regime is akin to domain wall Walker-breakdown in ferromagnets and involves the nucleation of an antiferromagnetic domain wall pair. Subsequently, one of the nucleated 180$^{\circ}$ domain wall creates with the original domain wall a 360$^{\circ}$ spin-rotation which remains static even under the action of the spin-orbit field. The other 180$^{\circ}$ domain wall becomes accelerated to super-magnonic speeds. Under large spin-orbit fields, multiple domain wall generation and recombination is obtained which may explain the recently experimentally observed current pulse induce shattering of large domain structures into small fragmented domains and the subsequent slow recreation of large-scale domain formation prior current pulse.
