Ultrafast Dynamics of choral spin structures in magnetic multilayer systems

磁性多层系统中合唱自旋结构的超快动力学

• 批准号: 518269020
• 负责人: Professor Dr. Christian Gutt
• 金额: --
• 依托单位: Department Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/518269020?language=en
• 关键词: Ultrafast; Dynamics; choral; spin; structures

The aim of this project is to study the ultrafast chiral dynamics by employing time-resolved X-ray resonant magnetic scattering methods using both X-ray free-electron laser sources and sources based on higher harmonic generation in the laboratory. We propose to employ IR and X-ray excitation of different magnetic systems display chiral magnetic order and to probe the temporal evolution of the chiral and collinear magnetic order parameters Since the characteristic timescale for the onset of the chiral magnetic order and its ultrafast dynamics are unexplored up to now, we need to ascertain both, as they hold fundamental insights into the underlying physical mechanisms and allow us to gauge the ultimate speed for the manipulation of chiral magnetism, e.g., for ultrafast writing of chiral spin textures. We propose to investigate the following aspects to understand ultrafast dynamics of chiral magnetism in multilayer systems: (i) the role of size and sign of the Dzyaloshinskii-Moriya interaction in ferromagnetic systems and (ii) static and dynamic properties of chiral topological objects such as skyrmions.

本项目的目的是利用时间分辨x射线共振磁散射方法，在实验室中使用x射线自由电子激光源和基于高次谐波产生的源，研究超快手性动力学。我们建议利用红外和x射线激发不同的磁系统显示手性磁序，并探索手性和共线磁序参数的时间演变。由于手性磁序发生的特征时间尺度及其超快动力学至今尚未被探索，我们需要确定这两者。因为它们对潜在的物理机制有基本的了解，并允许我们测量手性磁性操作的最终速度，例如，手性自旋织构的超快写入。我们建议研究以下几个方面来理解多层系统中手性磁的超快动力学：(i) Dzyaloshinskii-Moriya相互作用的大小和符号在铁磁系统中的作用；（ii）手性拓扑物体（如skyrmions）的静态和动态特性。