发表机构
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University; Research Institute of Electrical Communication, Tohoku University; Institute for Materials Research, Tohoku University; Center for Science and Innovation in Spintronics, Tohoku University; International Center for Synchrotron Radiation Innovation Smart, Tohoku University（东北大学前沿跨学科研究院; 东北大学电气通信研究所; 东北大学材料科学研究所; 东北大学自旋电子学科学与创新中心; 东北大学同步辐射创新智能国际中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出合成反铁磁体中交错阻尼类自旋轨道矩的理论，推导出畴壁速度的闭合形式，并预测符号反转与标度律，为实验提供直接目标。
AI 中文摘要
Néel型或交错自旋轨道矩（SOT）能够实现对反铁磁序的高效电学操控。然而，它一直与特殊晶体结构相关联，且仅确立了其类场分量。我们发展了一种交错阻尼类SOT的理论，该效应在两侧由相同重金属夹持的合成反铁磁体中普遍产生。通过推导Néel矢量拉格朗日量，我们得到了畴壁（DW）速度的闭合形式：该速度与电流和面内磁场呈双线性关系，对Néel壁和Bloch壁符号相反，并可通过层间交换耦合进行调节。因此，畴壁结构成为控制畴壁运动的旋钮，而畴壁运动反过来又为其结构提供电学读出。微磁模拟证实了该理论。所预测的畴壁速度的符号反转和标度律，以及Néel-Bloch转变的阈值，为实验提供了直接目标。
英文摘要
The Néel, or staggered, spin-orbit torque (SOT) enables an efficient electrical manipulation of antiferromagnetic order. However, it has been tied to special crystal structures, and only its field-like component is established. We develop a theory of staggered damping-like SOT, which arises generically in synthetic antiferromagnets sandwiched by the same heavy metal on both sides. Deriving a Néel-vector Lagrangian, we obtain the domain-wall (DW) velocity in closed form: bilinear in current and in-plane field, opposite in sign for Néel and Bloch walls, and tunable through the interlayer exchange coupling. DW structure thus becomes a control knob for DW motion, while the DW motion, in turn, offers an electrical readout of its structure. Micromagnetic simulations confirm the theory. The predicted sign reversals and scaling laws of the DW velocity, together with the thresholds for the Néel-Bloch transition, give immediate experimental targets.
Comments22 pages, 4 figures, including Supplemental Material
