Corbino 盘中非共线自旋织构的圆周运动：Néel 型与 Bloch 型斯格明子及斯格明子离子的动力学
Circular motion of non-collinear spin textures in Corbino disks: Dynamics of Néel- versus Bloch-type skyrmions and skyrmioniums
AI总结：
本研究通过解析与微磁模拟揭示，在 Corbino 盘中自旋轨道力矩驱动下 Bloch 斯格明子做 MHz 圆周运动而 Néel 型受阻，拓扑平凡的斯格明子离子运动更快且可承受更高电流密度。
摘要：
磁性斯格明子是纳米尺度的磁涡旋，可通过自旋力矩由电流驱动。它们是自旋电子器件（如赛道存储器）的有前景候选者，其中通常期望沿均匀电流方向运动。然而，对于 Corbino 盘中的自旋力矩纳米振荡器，目标是实现垂直于径向施加电流的圆周运动。基于解析计算和微磁模拟，我们表明 Bloch 斯格明子在自旋轨道力矩驱动下以 MHz 范围内的频率进行圆周运动。相比之下，Néel 斯格明子则卡在盘边缘。我们的分析揭示，Bloch 型和 Néel 型磁织构之间的对抗性动力学源于其螺旋度。此外，我们发现斯格明子离子（skyrmioniums）是斯格明子的拓扑平凡变体，运动速度更快，并允许增加电流密度而不会被推向盘边缘。当改用自旋转移力矩驱动时，Bloch 和 Néel 斯格明子不再表现出不同的动力学。相反，由于拓扑荷引起的斯格明子霍尔效应，它们沿圆周轨迹运动。因此，拓扑平凡的斯格明子离子在这种情况下不可避免地被困在盘边缘。为了提供全面的理解，我们的研究还考察了切向施加的电流，进一步丰富了我们对斯格明子动力学以及基于斯格明子器件的适当电流注入方法的见解。
英文摘要：
Magnetic skyrmions are nano-scale magnetic whirls that can be driven by currents via spin torques. They are promising candidates for spintronic devices such as the racetrack memory, where a motion along the uniform current is typically desired. However, for spin torque nano-oscillators in Corbino disks, the goal is to achieve a circular motion, perpendicular to the radially applied current. As we show, based on analytical calculations and micromagnetic simulations, Bloch skyrmions engage in a circular motion with frequencies in the MHz range when driven by spin-orbit torques. In contrast, Néel skyrmions get stuck at the edges of the disk. Our analysis reveals that the antagonistic dynamics between Bloch- and Néel-type magnetic textures arise from their helicity. Furthermore, we find that skyrmioniums, which are topologically trivial variations of skyrmions, move even faster and allow an increase in the current density without being pushed toward the edges of the disk. When driven by spin-transfer torques instead, Bloch and Néel skyrmions no longer exhibit different dynamics. Instead, they move along a circular trajectory due to the skyrmion Hall effect caused by their topological charge. Consequently, the topologically trivial skyrmioniums inevitably become trapped at the disk edge in this scenario. To provide a comprehensive understanding, our study also examines currents applied tangentially, further enriching our insights into skyrmion dynamics and appropriate current injection methods for skyrmion-based devices.
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