A magnetic bibubble is a composite structure involving two magnetic bubbles with topological skyrmion number $N_{\mathrm{sk}}=\pm 2$, which can be formed by merging two individual magnetic bubbles. Unlike the normal magnetic bubble, the axial symmetry of the bibubble is thus broken, which provide us an ideal platform to study the dynamics of topological structures with skyrmion number larger than unity. In this work, we studied the dynamics of the bibubble driven by a magnetic field gradient using micromagnetic simulations. We show that both the velocity and the skyrmion hall angle depend on the angle between the field gradient and the orientation of the bibubble. Moreover, the bibubble performs an orbital motion in the presence of circular field gradients accompanying with an oscillation of its orientation.

磁泡是由两个具有拓扑斯格明子数的磁泡组成的复合结构 $N_{\mathrm{斯克}}=\pm 2$，可以通过合并两个单独的磁泡形成。与普通磁泡不同，双泡的轴对称性因此被打破，这为我们研究斯格明子数大于1的拓扑结构的动力学提供了理想的平台。在这项工作中，我们使用微磁模拟研究了由磁场梯度驱动的气泡的动力学。我们表明，速度和斯格明霍尔角都取决于场梯度和气泡方向之间的角度。此外，气泡在存在圆形场梯度的情况下进行轨道运动，并伴随其方向的振荡。