用电阻窄带噪声探测受限几何中Skyrmion晶格的慢steady flow
Slow steady flow of a skyrmion lattice in a confined geometry probed by resistance narrow-band noise
摘要：
利用电阻涨落谱，我们观察到电流感生窄带噪声（NBN）的磁性skyrmion晶格相的微米尺寸的MnSi。只有当电流密度超过阈值时，NBN才会出现，这表明电流驱动的Skyrmion晶格运动触发了NBN。在$\sim$ 10 $^{9}$ A/m $^{2}$时，观测到的NBN频率为10-10 $^4$ Hz，这意味着Skyrmion稳态流速为1-100 $μ$ m/s，比以前报道的慢3-5个数量级。的NBN频率的温度演变表明，稳定的流动需要热激活过程，这是最有可能的，由于skyrmion创建和湮灭在样品边缘。我们考虑边界效应的数值模拟定性地支持了这种情况，这表明边缘限制了skyrmions的稳定流动，特别是在低温下。我们讨论了一种机制，大大减缓了skyrmion稳定流在微加工标本。
英文摘要：
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.
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