Atomic magnetism of skyrmion lattices: Probing Dzyaloshinskii-Moriya interactions using advanced low temperature conversion electron Mössbauer spectroscopy

我的研究项目主要是研究纳米级磁性的机制，特别是在界面上。特别感兴趣的是理解被称为skyrmions的磁性结构的纳米级漩涡的稳定性。Skyrmions表现为粒子，可以移动、创造和消灭。它们将彻底改变自旋电子学，因为它们可以执行算术逻辑，并在室温下使用电流提供超低能量信息存储和射频技术。创建和控制skyrmions需要知道如何操纵界面上邻近原子的自旋轨道耦合（SOC）磁性。光谱学是用来量化SOC的天然工具，Mössbauer光谱学非常适合探测SOC和界面磁性。手性决定了其大部分性质，手性相互作用由Dzyaloshinskii-Moriya相互作用（DMI）稳定。在20世纪60年代和70年代，Mössbauer光谱学是量化块状化合物中DMI的关键，并确定了DMI驱动的磁性的潜在物理原理，现在用于天空电子薄膜。有了提议的设备和我在光谱学和新型探测器物理方面的专业知识，我打算为理解skyrmins的界面物理开辟一条新的途径。******本设备方案适用于具有5至300 K（-270至25C）温度能力的Mössbauer制冷系统。它将为天空离子（和其他）薄膜上的新型转换电子Mössbauer光谱实验提供无振动和温控环境。将这种技术应用到薄膜上的挑战是巨大的，但我的团队已经做好了成功的最佳准备。使用提议的设备进行的实验将提供关键信息，并补充我的小组使用的其他技术，例如也探测SOC磁性的x射线同步加速器光谱。总的来说，我的HQP发现的新见解肯定会显著增强对SOC的理解，并从SOC效应、各向异性和DMI中识别界面上过程的物理特性。这一新知识将远远超出skyronic薄膜的应用范围，应用于当前和未来信息存储（例如媒体和传感）的界面磁性。与希捷科技研发中心的工业合作伙伴的知识转化将为新技术提供动力。光谱学是我的研究和HQP培训的核心，所要求的设备将促进两者的发展。我们用这台设备所做的研究将使我的HQP学习尖端的仪器设计和构造（包括可转移到先进制造业的新的3D打印和设计技能），真空系统，低温，探测器，快速电子和计算机数据采集。我的HQP从这个设备中学到的技能将在他们以后从事研究和技术行业的职业生涯中发挥非常大的作用。

My research program is focused on the study of the mechanisms responsible for nanoscale magnetism, especially at interfaces. Of special interest is understanding the stabilization of the nanosized swirls of magnetic texture called skyrmions. Skyrmions behave as particles and can be moved, created and annihilated. They will revolutionize spintronics as they can be made to perform arithmetic logic, and offer ultra low energy information storage and radio frequency technologies at room temperature using electrical currents. Creating and controlling skyrmions requires knowing how to manipulate the spin-orbit coupling (SOC) magnetism of neighbouring atoms at interfaces. Spectroscopy is a natural tool to use to quantify SOC, and Mössbauer spectroscopy is ideally suited to probe the SOC and interfacial magnetism. The chirality of skyrmions determines most properties, and the chiral interactions are stabilized by the Dzyaloshinskii-Moriya interaction (DMI). In the 1960s and 70s, Mössbauer spectroscopy was key to quantifying DMI in bulk compounds, and identifying the underlying physics of DMI-driven magnetism that are now used in skyrmionic thin films. With the proposed equipment and my expertise in spectroscopy and new detector physics, I intend to open up a new avenue towards understanding the interface physics of skyrmions.******This equipment proposal is for a Mössbauer refrigeration system with 5 to 300 K (-270 to 25C) temperature capability. It will provide a vibration-free and temperature controlled environment for novel conversion electron Mössbauer spectroscopy experiments on skymionic (and other) thin films. The challenges of updating this technique to thin films are significant, but my group is optimally positioned to succeed. The experiments using the proposed equipment will provide key information and complement the other techniques my group uses, such as x-ray synchrotron spectroscopies that also probe SOC magnetism. Overall, the new insights my HQP discover are sure to enhance significantly the understanding of SOC, and the identification of the physics of processes at interfaces from SOC effects, anisotropy, and DMI. This new knowledge will apply well beyond skyrmionic films to the magnetism at interfaces that underlie current and future information storage (e.g. media and sensing). Knowledge translation with industrial collaborators at Seagate Technology R&D will feed into new technologies. Spectroscopy is central to my research and HQP training, and the requested equipment will advance both. The research we do with this equipment will have my HQP learn cutting-edge instrument design and construction (including new 3D printing and design skills that are transferable to advanced manufacturing), vacuum systems, cryogenics, detectors, fast electronics and computer data acquisition. The skills my HQP learn with this equipment will serve them exceptionally well later in their careers in research- and technology-based industries.