The 1-kink skyrmion is a topological spin texture composed of a skyrmion having a chiral kink inside its Néel domain wall, this chiral kink being also called domain wall skyrmion. By micromagnetic simulations we have studied the stability of the 1-kink skyrmion as well as its spin-driven dynamics in Pt/Co/MgO. Such trilayer system allows simultaneously the stabilization of various spin textures including skyrmion (Sk, topological charge $Q=1$), 1-kink skyrmion (1kSk, $Q=2$), and domain wall skyrmion (DWSk, $Q=1$). The 1-kink skyrmion is found to be robust against both thermal fluctuations and normally distributed anisotropy for different grainlike region sizes. Such magnetization pattern has a certain resilience to the variation of the Dzyaloshinskii-Moriya interaction and applied magnetic field. The static analysis is complemented with the investigation of the dynamic regime of motion under electrical current. In the limit of moderate injected current the skyrmion and the 1-kink skyrmion behave similarly. However, depending on the geometry of the injected current, the 1-kink skyrmion can be transformed into a single skyrmion or splits in two skyrmions, opening the path to conceive high density logical devices, enabling novel functionalities for logic operations.

中文翻译：

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Pt/Co/MgO三层中1-扭结skyrmion的静态和动态特性

1-扭结skyrmion 是一种拓扑自旋纹理，由在其Néel 畴壁内具有手性扭结的skyrmion 组成，这种手性扭结也称为畴壁skyrmion。通过微磁模拟，我们研究了 1-扭结skyrmion 的稳定性及其在 Pt/Co/MgO 中的自旋驱动动力学。这种三层系统允许同时稳定各种自旋纹理，包括斯格明子（Sk，拓扑电荷$问=1$), 1-扭结skyrmion (1kSk, $问=2$), 和畴壁skyrmion (DWSk, $问=1$）。发现 1-扭结skyrmion 对于不同的颗粒状区域大小，对热波动和正态分布的各向异性都具有鲁棒性。这种磁化模式对 Dzyaloshinskii-Moriya 相互作用和外加磁场的变化具有一定的弹性。静态分析与电流下动态运动状态的研究相辅相成。在中等注入电流的限制下，skyrmion 和 1-kink skyrmion 表现相似。然而，根据注入电流的几何形状，1-kink 斯格明子可以转换为单个斯格明子或分裂成两个斯格明子，为构思高密度逻辑器件开辟了道路，为逻辑运算提供了新的功能。