论文标题
在电阻窄带噪声探测的密闭几何形状中，天空晶格的稳定流量缓慢
Slow steady flow of a skyrmion lattice in a confined geometry probed by resistance narrow-band noise
论文作者
论文摘要
使用电阻波动光谱，我们观察到电流诱导的窄带噪声（NBN）在微米大小的MNSI的磁性天空晶格中。仅当电流密度超过阈值时，NBN才会出现，这表明Skyrmion晶格的电流驱动运动会触发NBN。观察到的NBN频率为10-10 $^4 $ Hz，$ \ sim $ \ sim $ 10 $^{9} $ a/m $^{2} $，这意味着Skyrmion稳定流速为1-100 $ $ m/s，比以前报道的速度比先前慢的3-5个级别。 NBN频率的温度演变表明，稳定的流动需要热活化的过程，这很可能是由于样品边缘的天空产生和歼灭所致。考虑到边界效应的数值模拟，这种情况在定性上支持，这表明边缘限制了天空的稳定流动，尤其是在低温下。我们讨论了一种机制，该机制会大大减慢微生物标本中的天际稳定流量。
Using resistance fluctuation spectroscopy, we observe current-induced narrow-band noise (NBN) in the magnetic skyrmion-lattice phase of micrometer-sized MnSi. The NBN appears only when electric-current density exceeds a threshold value, indicating that the current-driven motion of the skyrmion lattice triggers the NBN. The observed NBN frequency is 10-10$^4$ Hz at $\sim$10$^{9}$ A/m$^{2}$, implying a skyrmion steady flow velocity of 1-100 $μ$m/s, 3-5 orders of magnitude slower than previously reported. The temperature evolution of the NBN frequency suggests that the steady flow entails thermally activated processes, which are most likely due to skyrmion creation and annihilation at the sample edges. This scenario is qualitatively supported by our numerical simulations considering boundary effects, which reveals that the edges limit the steady flow of skyrmions, especially at low temperatures. We discuss a mechanism that dramatically slows the skyrmion steady flow in a microfabricated specimen.
