Magnetic skyrmions have garnered attention for their potential roles in spintronic applications, such as information carriers in computation, data storage, and nano-oscillators due to their small size, topological stability, and the requirement of small electric currents to manipulate them. Two key challenges in harnessing skyrmions are the stabilization requirement through a strong out-of-plane field, and the skyrmion Hall effect (SkHE). Here, we present a systematic model study of skyrmions in ferromagnetic/antiferromagnetic (FM/AFM) multilayer structures by employing both atomistic Monte Carlo and atomistic spin dynamics simulations. We demonstrate that skyrmions stabilized by exchange bias have superior stability to field-stabilized skyrmions due to the formation of a magnetic imprint within the AFM layer. Additionally, stacking two skyrmion hosting FM layers between two AFM layers suppresses the SkHE and enables the transport of AFM-coupled skyrmions with high velocity in the order of a few km/s. This proposed multilayer configuration could serve as a pathway to overcome existing limitations in the development of skyrmion-based devices, and the insights obtained through this study contribute significantly to the broader understanding of topological spin textures in magnetic materials.

中文翻译：

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FM/AFM 异质结构中磁性斯格明子的稳定性和动力学


磁性斯格明子因其尺寸小、拓扑稳定性以及需要小电流来操纵它们而因其在自旋电子应用中的潜在作用而受到关注，例如计算、数据存储和纳米振荡器中的信息载体。利用斯格明子的两个关键挑战是通过强大的面外场实现稳定性要求，以及斯格明子霍尔效应（SkHE）。在这里，我们通过采用原子蒙特卡罗和原子自旋动力学模拟，提出了铁磁/反铁磁（FM/AFM）多层结构中斯格明子的系统模型研究。我们证明，由于在 AFM 层内形成磁性印记，通过交换偏压稳定的斯格明子比场稳定的斯格明子具有更高的稳定性。此外，在两个 AFM 层之间堆叠两个托管 FM 层的斯格明子可以抑制 SkHE，并实现 AFM 耦合斯格明子以几公里/秒的高速传输。这种提出的多层配置可以作为克服基于斯格明子的器件开发中现有限制的途径，并且通过这项研究获得的见解有助于更广泛地理解磁性材料中的拓扑自旋纹理。