The effect of the spatially varying spin current on a skyrmion is numerically investigated. It is shown that an inhomogeneous current density induces an elongation of the skyrmion. This elongation can be controlled using current pulses of different strength and duration. Long current pulses lead to a splitting that forms two replicas of the initial skyrmion while for short pulses the elongated skyrmion relaxes back to its initial circular state through rotation in the MHz-GHz frequency range. The frequency is dependent on the strength of the damping coefficient.

中文翻译：

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Skyrmion 在空间变化的自旋电流下通过自旋转移扭矩的伸长、复制和旋转

数值研究了空间变化的自旋电流对斯格明子的影响。结果表明，不均匀的电流密度会引起斯格明子的伸长。可以使用不同强度和持续时间的电流脉冲来控制这种伸长。长电流脉冲导致分裂，形成初始斯格明子的两个副本，而对于短脉冲，拉长的斯格明子通过在 MHz-GHz 频率范围内旋转而松弛回其初始圆形状态。频率取决于阻尼系数的强度。