论文标题
与缺陷相关的天际和垂直磁化的COFEB Ultrathin膜中的可控产生
Defect-Correlated Skyrmions and Controllable Generation in Perpendicularly Magnetized CoFeB Ultrathin Films
论文作者
论文摘要
由于其拓扑旋转结构和引人入胜的物理特征，Skyrmions引起了极大的兴趣。 Skyrmion阶段是在界面或非中心对称材料体积的Dzyaloshinskii-Moriya（DM）相互作用的材料中产生的。然而，尽管天空是通过实验生成的，但制造，微结构，磁化和天空的存在之间的一种关键的内在关系仍有待确定。在这里，采用了两种具有控制原子尺度结构的COFEB超薄膜来揭示这种关系。通过颠倒生长顺序，可以人为地调节缺陷的量，并显示出在缺陷部位优先形成的天空。可以通过利用一阶反向曲线到达各种亚稳态状态，在回流磁化环中有效地控制稳定区域和天空密度。这些发现建立了从样本制备到天际产生的一般和内在关系，提供了一种控制天际密度的通用方法。
Skyrmions have attracted significant interest due to their topological spin structures and fascinating physical features. The skyrmion phase arises in materials with Dzyaloshinskii-Moriya (DM) interaction at interfaces or in volume of non-centrosymmetric materials. However, although skyrmions were generated experimentally, one critical intrinsic relationship between fabrication, microstructures, magnetization and the existence of skyrmions remains to be established. Here, two series of CoFeB ultrathin films with controlled atomic scale structures are employed to reveal this relationship. By inverting the growth order, the amount of defects can be artificially tuned, and skyrmions are shown to be preferentially formed at defect sites. The stable region and the density of the skyrmions can be efficiently controlled in the return magnetization loops by utilizing first-order reversal curves to reach various metastable states. These findings establish the general and intrinsic relationship from sample preparation to skyrmion generation, offering an universal method to control skyrmion density.
