个体操控斯格明子的涨落与钉扎
Fluctuations and Pinning for Individually Manipulated Skyrmions
AI总结：
本文数值研究单个拖拽斯格明子与阵列及无序相互作用，发现脱钉阈值受弹性与无序影响，强钉扎产生粘滑运动，且密度变化导致非单调脱钉和重入钉扎相。
摘要：
我们数值研究了单个拖拽斯格明子与其他斯格明子阵列及淬火无序同时相互作用时的动力学。对于略高于脱钉力的驱动，我们观察到具有$1/f$特征的宽带噪声信号，而在较高驱动下，则出现窄带或白噪声。即使在无淬火无序的情况下，由于与其他斯格明子的弹性相互作用，平移驱动斯格明子所需施加的阈值力也是有限的。脱钉阈值随淬火无序强度的增加而增大。在高于脱钉力时，由于钉扎位点阻止其他斯格明子被驱动斯格明子拖拽，斯格明子在存在淬火无序时的运动速度比在无无序系统中更快。对于强钉扎，我们发现驱动斯格明子出现粘滑运动，产生电报噪声特征。在无淬火无序时，脱钉阈值随斯格明子密度单调增加，但当存在钉扎时，脱钉阈值随斯格明子密度非单调变化，并且由于淬火无序诱导的钉扎与斯格明子晶格弹性相互作用产生的钉扎之间的竞争，出现可重入的钉扎相。
英文摘要：
We numerically examine the dynamics of individually dragged skyrmions interacting simultaneously with an array of other skyrmions and quenched disorder. For drives just above depinning, we observe a broad band noise signal with a $1/f$ characteristic, while at higher drives, narrow band or white noise appears. Even in the absence of quenched disorder, the threshold force that must be applied to translate the driven skyrmion is finite due to elastic interactions with other skyrmions. The depinning threshold increases as the strength of the quenched disorder is raised. Above the depinning force, the skyrmion moves faster in the presence of quenched disorder than in a disorder-free system since the pinning sites prevent other skyrmions from being dragged along with the driven skyrmion. For strong pinning, we find a stick-slip motion of the driven skyrmion which produces a telegraph noise signature. The depinning threshold increases monotonically with skyrmion density in the absence of quenched disorder, but when pinning is present, the depinning threshold changes nonmonotonically with skyrmion density and there are reentrant pinned phases due to a competition between pinning induced by the quenched disorder and that produced by the elastic interactions of the skyrmion lattice.
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