Collaborative research: The effects of Dzyaloshinskii Moriya interactions on magnetization dynamics in layered thin films

非技术摘要：该项目的重点是研究铁磁和非磁性材料之间的边界可能产生的相互作用。这种相互作用是形成磁结构的关键，磁结构有可能成为存储和传输信息的新手段，它还导致磁性材料的性质发生不寻常的变化，这对未来的设备很重要。布林莫尔学院和科罗拉多州立大学的研究小组正在采取合作的方法来研究磁相互作用和磁化动力学，以获得对相互作用效应的基本物理学的新见解。青年一代的教育是该项目的一个重要组成部分。公共教育机构努力让本科生和研究生参与并对他们进行培训，特别是妇女和来自代表性不足的少数群体的学生。参与该项目的学生也有机会与阿贡国家实验室的科学家合作，并获得成像经验。研究所将该项目的研究实例纳入两个机构的教学和外联活动。技术摘要：导致各向异性交换效应的Dzyaloshinskiii-Moriya相互作用（Dzyaloshinskiii-Moriya interactions）在磁学和自旋电子学相关研究中迅速引起关注。如果非磁性层表现出高的自旋轨道耦合，则由破缺的反转对称性和自旋轨道耦合引起的自旋极化可以发生在体手性晶体中和非磁性/磁性界面处。电子自旋促进稳定的手性磁自旋配置，如skyrmions的形成，并显着修改薄膜系统中的动态过程。结果表明，双折射可以影响Skyrmion和畴壁运动，并导致扩展薄膜中表面自旋波的非互易性。自旋动力学的波长由于几何约束效应而固有地短，因此自旋动力学还应当显著地修改图案化磁性纳米结构中的动力学。在这个合作研究项目中，研究小组正在研究界面的相互作用对skyrmion形成和扩展和图案化多层膜中的自旋动力学的影响。多层膜提供了一种在室温下稳定亚微米尺寸的skyrmions的方法，不仅通过选择材料来调整介电常数和表面各向异性，而且通过改变重复次数来调整静磁相互作用。该项目的结果导致新的信息，界面上的bronze和bronze的skyrmion形成和自旋动力学在受限的几何形状的影响。

Non-Technical Abstract:This project focuses on the study of the interactions that can arise at the boundary between ferromagnetic and non-magnetic materials. This interaction is key to the formation of magnetic structures that have potential as a new means to store and transmit information, and it also leads to unusual modifications of the properties of magnetic materials, important for future devices. The research teams at Bryn Mawr College and Colorado State University are taking a collaborative approach to study magnetic interactions and magnetization dynamics in order to gain new insight into the underlying physics of the interaction effects. Education for the young generation is an important component of this project. The PIs strive to involve and train students at both the undergraduate and graduate levels, especially women and students from underrepresented minority groups. The students working on this project also have the opportunity to collaborate with scientists at Argonne National Laboratory and gain hands on imaging experience. The PIs incorporate research examples from this project into teaching and outreach activities at both institutions. Technical Abstract:Dzyaloshinskii-Moriya interactions (DMI) that lead to anisotropic exchange effects are rapidly gaining attention in magnetism and spintronics-related research. DMI, which arise from broken inversion symmetry and spin-orbit coupling, can occur in bulk chiral crystals and at non-magnetic/magnetic interfaces if the non-magnetic layer exhibits high spin orbit coupling. DMI promote the formation of stable chiral magnetic spin configurations such as skyrmions, and significantly modify dynamic processes in thin film systems. It has been shown that DMI can influence skyrmion and domain wall motion and that DMI lead to a nonreciprocity for surface spin waves in extended thin films. DMI should also significantly modify the dynamics in patterned magnetic nanostructures where the wavelengths of the spin dynamics are inherently short due to geometric confinement effects. In this collaborative research project, the research teams are investigating the effects of interfacial DMI on skyrmion formation and on spin dynamics in both extended and patterned multilayered films. Multilayers provide a means to stabilize submicron-sized skyrmions at room temperature by tuning not only DMI and surface anisotropies through the choice of the materials, but also the magnetostatic interactions through varying the number of repeats. The results of this project lead to new information on interfacial DMI and the effects of DMI on skyrmion formation and spin dynamics in confined geometries.