具有畴壁对的多Skyrmion的电流感生动力学和基于Skyrmion的择多门设计
Current Induced Dynamics of Multiple Skyrmions with Domain Wall Pair and Skyrmion-based Majority Gate Design
摘要：
Skyrmion作为一种有趣的超小颗粒状磁性织构，在下一代超密度、低功耗磁存储器/逻辑设计中引起了广泛的研究兴趣。先前的研究已经证明了一个特殊设计的磁跑道结中的单个Skyrmion畴壁对碰撞。在这项工作中，我们研究了多个Skyrmions与畴壁对在磁赛道的动力学。数值微磁模拟结果表明，矩形槽钉扎位置对畴壁对的钉扎或脱钉作用取决于跑道中skyrmion的数目和驱动电流密度的大小.这种突现动力学性质可以用来实现阈值可调的阶跃函数，其中输入是skyrmions，阈值可以通过驱动电流密度来调节。阈值可调阶跃函数广泛应用于逻辑和神经网络应用中。我们也提出了一个三输入的skyrmion为基础的多数逻辑门的设计，以证明这种动态相互作用的多个skyrmion和畴壁对的潜在应用。
英文摘要：
As an intriguing ultra-small particle-like magnetic texture, skyrmion has attracted lots of research interests in next-generation ultra-dense and low power magnetic memory/logic designs. Previous studies have demonstrated a single skyrmion-domain wall pair collision in a specially designed magnetic racetrack junction. In this work, we investigate the dynamics of multiple skyrmions with domain wall pair in a magnetic racetrack. The numerical micromagnetic simulation results indicate that the domain wall pair could be pinned or depinned by the rectangular notch pinning site depending on both the number of skyrmions in the racetrack and the magnitude of driving current density. Such emergent dynamical property could be used to implement a threshold-tunable step function, in which the inputs are skyrmions and threshold could be tuned by the driving current density. The threshold-tunable step function is widely used in logic and neural network applications. We also present a three-input skyrmion-based majority logic gate design to demonstrate the potential application of such dynamic interaction of multiple skyrmions and domain wall pair.
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