论文标题
天空几乎是缺陷
Skyrmions Near Defects
论文作者
论文摘要
我们研究了减少交换缺陷对有限厚度薄膜的天际效果的影响。在晶格模型中，通过计算交换，dzyaloshinskii-moriya相互作用，磁各向异性和偶极 - 偶极偶极偶联的微磁能来证明了天空对缺陷的吸引力。通过在晶格上和独立地，用两种方法彼此一致的方式，在数值上求解了整个Landau-lifshitz-gilbert方程，从而说明了Skyrmion向缺陷的螺旋动力学。我们发现，在接近缺陷时，天空会变形。在远离决定天空稳定性的相位边界的参数空间中，变形很小。它在相边界附近急剧增加，从而导致缺陷通过蛇形磁性域变化。
We study the impact of an exchange-reducing defect on a skyrmion for a thin film of finite thickness. Attraction of the skyrmion to a defect is demonstrated in a lattice model by computing the micromagnetic energy accounting for the exchange, Dzyaloshinskii-Moriya interaction, magnetic anisotropy, and dipole-dipole coupling. The spiraling dynamics of the skyrmion towards the defect is illustrated by solving numerically the full Landau-Lifshitz-Gilbert equations on a lattice and, independently, the Thiele equation, with the two methods in agreement with each other. We find that the skyrmion deforms when approaching the defect. Deformation is small in the parameter space far from the phase boundary that determines stability of skyrmions. It increases dramatically near the phase boundary, leading to the transformation of the skyrmion by the defect into a snake-like magnetic domain.
