利用斯格明子霍尔效应实现管状合成反铁磁体中的低功耗斯格明子输运

中文摘要 AI 辅助

我们表明，最优控制可将斯格明子霍尔效应从通常不受欢迎的横向运动来源转变为降低斯格明子输运中欧姆损耗的机制。我们考虑一对被限制在管状几何结构中的反铁磁耦合斯格明子，它们的相对横向位移成为周期性内部坐标。斯格明子霍尔效应驱动该坐标，而有限层间耦合使所施加电流与纵向速度之间的关系呈非线性，允许不同电流方案产生相同的规定平均速度。我们确定这些方案中哪一个能最小化焦耳热。根据层间耦合和自旋转移力矩参数，最优电流要么是恒定的，此时斯格明子对保持固定相对位置；要么是随时间变化的，此时斯格明子对围绕管进行周期性相对运动。无论哪种情况，斯格明子霍尔效应和层间耦合产生的额外内部自由度都能实现比特极限下更低功耗的斯格明子输运。

英文摘要

We show that optimal control can turn the skyrmion Hall effect from a source of typically unwanted transverse motion into a mechanism for reducing Ohmic losses in skyrmion transport. We consider a pair of antiferromagnetically coupled skyrmions confined to a tubular geometry, where their relative transverse displacement becomes a periodic internal coordinate. The skyrmion Hall effect drives this coordinate, while finite interlayer coupling makes the resulting relation between applied current and longitudinal velocity nonlinear, allowing different current protocols to produce the same prescribed average velocity. We determine which of these protocols minimizes Joule heating. Depending on the interlayer coupling and spin-transfer-torque parameters, the optimal current is either constant, with the skyrmion pair maintaining a fixed relative position, or time dependent, with the pair undergoing periodic relative motion around the tube. In either case, the additional internal degree of freedom created by the skyrmion Hall effect and interlayer coupling enables skyrmion transport at a lower power than in the uncoupled limit.

发表机构

• Linnaeus University（林奈大学）
• University of Iceland（冰岛大学）
• ITMO University（伊托莫大学）

机构由 AI 辅助整理，请以论文原文为准。