发表机构
Institute of Physics, Johannes Gutenberg University Mainz; Université Grenoble Alpes, CNRS, CEA, SPINTEC; Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University; Peter Grünberg Institute, Forschungszentrum Jülich and JARA; Department of Physics and Astronomy, Uppsala University; Wallenberg Initiative Materials Science, WISE, Uppsala University; Helmholtz-Zentrum Berlin für Materialien und Energie GmbH（美因茨约翰内斯·古腾堡大学物理研究所; 格勒诺布尔阿尔卑斯大学，法国国家科学研究中心，法国原子能和替代能源委员会，SPINTEC; 东北大学电气通信研究所纳米电子与自旋电子学实验室; 于利希研究中心和JARA的彼得·格林伯格研究所; 乌普萨拉大学物理与天文学系; 乌普萨拉大学瓦伦堡材料科学倡议WISE; 柏林亥姆霍兹材料与能源中心有限公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过层选择性各向异性工程，在合成反铁磁体中实现自旋翻转转变，形成由斯格明子与面内双斯格明子耦合的skymeron三维自旋纹理，并发现其具有极性相关的惯性动力学，为探索新型复合自旋纹理提供了途径。
AI 中文摘要
反铁磁体中的拓扑自旋纹理继承了宿主材料的补偿磁序，这导致斯格明子的斯格明子霍尔效应被抑制，并实现了超快动力学，使其对低功耗自旋电子器件具有吸引力。在固有反铁磁体中，两个亚晶格是相同的，但合成反铁磁体通过能够独立调节两个铁磁层的性质而提供了额外的控制机制。与亚铁磁体类似，总磁矩可以通过补偿两层磁矩来调整。在这里，我们证明了调节两层之间的有效磁各向异性差异会驱动自旋翻转转变，其中一层重新取向，从而稳定了一种正交构型，其中一层沿面外方向取向，另一层沿面内方向取向。在这种转变中，反铁磁斯格明子经历了一次同伦重构，形成了一种复杂的自旋纹理，包括一个斯格明子与一个面内双斯格明子耦合。元素特异性X射线显微镜逐层解析了这种纹理：一层承载面外斯格明子，与另一层中的面内双斯格明子耦合。我们将这种先前未被探索的三维自旋纹理称为skymeron。通过使用时间分辨泵浦-探测X射线显微镜，我们发现了电流脉冲期间独特的极性相关动力学：脉冲后短暂的类似惯性的运动延续，以及向钉扎初始状态的较慢返回。微磁模拟揭示，类似惯性的传播源于skymeron重取向的有限时间弛豫。我们的结果确立了层选择性各向异性工程作为通往具有内部动力学自由度的未知复合自旋纹理的途径，这在具有相同亚晶格的传统反铁磁体中是不可能的。
英文摘要
Topological spin textures in antiferromagnets inherit the compensated magnetic order of the host material, resulting for skyrmions in the suppression of the skyrmion Hall effect and enabling ultrafast dynamics that make them attractive for low-power spintronic devices. In intrinsic antiferromagnets, the two sublattices are identical, but synthetic antiferromagnets offer additional control mechanisms by enabling independent tuning of the properties of two ferromagnetic layers. Analogous to a ferrimagnet, the total magnetic moment can be adjusted by compensating the two-layer moments. Here, we demonstrate that tuning the effective magnetic anisotropy difference between the two layers drives a spin-flop transition where one layer reorients and thus stabilizes an orthogonal configuration with one layer oriented along the out-of-plane direction and the other in-plane. In this transition, an antiferromagnetic skyrmion undergoes a homotopic reconfiguration into a complex spin texture comprising a skyrmion coupled to an in-plane bimeron. Element-specific X-ray microscopy resolves this texture layer by layer: one hosts an out-of-plane skyrmion coupled to an in-plane bimeron in the other. We refer to this previously unexplored three-dimensional spin texture as a skymeron. By using time-resolved pump-probe X-ray microscopy, we discover unique polarity ,dependent dynamics during current pulses: a short post-pulse inertia-like continuation of the motion, and a slower return towards the pinned initial state. Micromagnetic simulations reveal that the inertia-like propagation originates from the finite-time relaxation of reorientation of the skymeron. Our results establish layer-selective anisotropy engineering as a route to uncharted composite spin textures with internal dynamical degrees of freedom, not possible in conventional antiferromagnets with identical sublattices.
