铁磁体中的旋转涡旋偶极子
Rotating vortex dipoles in ferromagnets
摘要：
涡旋-反涡旋对是一种局部化的激励，并且已经被发现在磁性元件中自发产生。在涡旋和反涡旋具有相反极性的情况下，该对具有非零拓扑荷，并且它表现为旋转涡旋偶极子。我们发现理论上，并确认数字，作为系统的角动量和相关的旋转频率的函数的能量的形式。我们讨论了能量单调递减时，使系统拓扑荷改变为1的对的湮灭过程。拓扑荷的这种变化深刻地影响着磁系统的动力学。最后，我们讨论了我们的结果与布洛赫点（BP）的联系以及对BP动力学的影响。
英文摘要：
Vortex-antivortex pairs are localized excitations and have been found to be spontaneously created in magnetic elements. In the case that the vortex and the antivortex have opposite polarities the pair has a nonzero topological charge, and it behaves as a rotating vortex dipole. We find theoretically, and confirm numerically, the form of the energy as a function of the angular momentum of the system and the associated rotation frequencies. We discuss the process of annihilation of the pair which changes the topological charge of the system by unity while its energy is monotonically decreasing. Such a change in the topological charge affects profoundly the dynamics in the magnetic system. We finally discuss the connection of our results with Bloch Points (BP) and the implications for BP dynamics.
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