Magnetic skyrmions are promising building blocks for next generation data storage due to their stability, small size and extremely low currents to drive them. Skyrmion-based metallic racetrack memory has potential to replace traditional domain walls to store information as data bits, in which, however, skyrmions can drift from the direction of electron flow due to the Magnus force. In addition, skyrmion-edge effect at the end of the racetrack can cause the clogging of the skyrmions at the end of the racetrack. Here, we show that the clogging of skyrmion signals can be avoided by adding various kinds of notch at the end of the racetracks. On the other hand, by adding high-[Formula: see text] materials (materials with high magnetic crystalline anisotropy) at the edges, the skyrmions can be confined in the center region of the metallic racetrack successfully. This design can overcome the problems of both clogging and annihilation according to our micromagnetic simulation. As a result, skyrmions can pass the right end of the racetrack efficiently at a very high speed (100–300[Formula: see text]m/s), whereas the driving current is much smaller in comparison with other racetrack design. Besides, we study the influence of the uneven part at the joint of the high-[Formula: see text] material and the CoPt racetrack on the skyrmionic motion. It is found that at the joint between the high-[Formula: see text] material and the CoPt racetrack, the concave part basically does not affect the passage of skyrmion, but the convex part does when the length and width of the convex part reach a certain value. The results show that the design has high feasibility.

中文翻译：

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通过克服 Skyrmion 信号的阻塞和湮没来设计和优化基于 Skyrmion 的赛道记忆

磁性斯格明子因其稳定性、体积小和驱动它们的极低电流而成为下一代数据存储的有希望的构建块。基于 Skyrmion 的金属跑道存储器有可能取代传统的畴壁以将信息存储为数据位，但是，在其中，由于马格努斯力，skyrmion 可能会偏离电子流的方向。此外，赛道末端的skyrmion边缘效应会导致赛道末端的skyrmion堵塞。在这里，我们展示了可以通过在赛道末端添加各种凹口来避免斯格明子信号的阻塞。另一方面，通过在边缘添加高[公式：见正文]材料（具有高磁性晶体各向异性的材料），斯格明子可以成功地限制在金属跑道的中心区域。根据我们的微磁模拟，这种设计可以克服堵塞和湮灭的问题。因此，skyrmions 可以以非常高的速度（100-300[公式：见文本]m/s）有效地通过赛道的右端，而与其他赛道设计相比，驱动电流要小得多。此外，我们研究了高[公式：见文本]材料与CoPt跑道接合处的不平坦部分对skyrmionic运动的影响。研究发现，在高[公式：见正文]材料与CoPt跑道的接缝处，凹部基本不影响skyrmion的通过，但凸部在凸部的长度和宽度达到一定的价值。