D$_{2d}$对称晶体中一维受限拓扑缺陷线的形成与磁驱动
Formation and Magnetic Drive of 1D-Confined Topological Defect Lines in Crystals with D$_{2d}$ Symmetry
AI总结：
本文提出基于可调磁各向异性在D$_{2d}$对称磁体中实现一维拓扑缺陷线（双斯格明子链），并通过洛伦兹电镜和全息术验证，弱磁场驱动其运动，为低耗散自旋电子器件提供新途径。
摘要：
在非共线磁背景下设计和控制拓扑自旋织构对于低耗散自旋电子器件的发展至关重要。本文提出了一种基于可调磁各向异性的通用机制，该机制能够在单轴D$_{2d}$对称磁体的本征自旋螺旋态中实现一维拓扑缺陷线的嵌入，并广泛适用于多种材料平台。利用洛伦兹透射电子显微镜和离轴电子全息术，我们证明将面内磁各向异性引入螺旋基态，可以稳定具有面内传播矢量的锥形螺旋相邻畴，这些畴共享相同的手性但表现出相反的净磁化强度。由此产生的界面失配生成了受限的双斯格明子链。重要的是，这些缺陷线不仅仅是诱导产生的斯格明子；它们的存在是由系统固有的特定D$_{2d}$对称性约束所决定的。沿锥轴施加弱磁场会驱动相邻双斯格明子链沿螺旋条纹反向运动，而各向异性介导的约束则实现了轨道稳定的横向漂移自由输运。本工作为在本征非共线磁态中稳定和控制拓扑自旋织构提供了一条清晰途径，增进了基础理解，并推动了低耗散、可扩展自旋电子器件概念的发展。
英文摘要：
Designing and controlling topological spin textures within non-collinear magnetic backgrounds is central to the development of low-dissipation spintronic devices. Here we propose a general mechanism based on tunable magnetic anisotropy that enables the realization of one-dimensional topological defect lines embedded within intrinsic spin-spiral states of uniaxial D$_{2d}$-symmetric magnets, and is broadly applicable across diverse material platforms. Using Lorentz transmission electron microscopy and off-axis electron holography, we show that introducing in-plane magnetic anisotropy into the helical ground state stabilizes adjacent domains of conical helices with in-plane propagation vectors, sharing the same handedness but exhibit opposite net magnetization. The resulting interfacial mismatch generates confined bimeron-chains. Significantly, these defect lines are not merely induced merons; their presence is mandated by the specific D$_{2d}$ symmetry constraints inherent to the system. Applying weak magnetic fields along the conical axis drives counter-propagating motion of adjacent bimeron-chains along the helical stripes, while anisotropy-mediated confinement enables track-stable transverse drift free transport. The present work establishes a clear route to stabilize and control topological spin textures within intrinsically non-collinear magnetic states, advancing fundamental understanding and enabling low-dissipation, scalable spintronic device concepts.
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