Skyrmion spectroscopy in ferro- and antiferromagnets

结合理论和布里渊光散射光谱学的专业知识，我们将探索铁磁和反铁磁薄膜中skyrmions的磁本征模，包括它们由于外部刺激而产生的激发。主要目的是获得一个一般的图片理解和控制内的单skyrmion和skyrmion晶格的磁激发。我们的主要实验工具将是布里渊光散射光谱（BLS）。关于薄膜中的自旋激发，BLS优于其他现有技术，因为其高灵敏度允许检测各种对称性的热激发磁本征模，甚至从单个微结构。BLS已经发展成为量化薄膜中Dzyaloshinskiii-Moriya相互作用强度的领先技术之一，我们将为SPP的所有成员提供这种实验工具，以对其层进行（比较）分析。这个项目的主要目的是解决几个关键问题的skyrmion激发使用国家的最先进的理论概念，模拟和BLS实验相结合的方法。第一个目标是分析和理解室温下skyrmion晶格和单个skyrmion的热布居谱。在这里，BLS提供了一种独特的方式来访问skyrmion激发有限波矢量。第二个关键目标是在外部刺激存在下线性skyrmion激发的综合图片。作为刺激，我们将考虑射频磁场和自旋电流。从激发光谱，我们将获得有价值的见解的潜在过程，管理的skyrmion动力学。作为第三个关键问题，我们将解决由强外部驱动引起的非线性skyrmion激发及其对基于skyrmion的技术的影响，如skyrmion赛道存储器或用于射频应用的skyrmion纳米振荡器。在我们的室温实验中，我们将专注于层系统纳入铁磁薄膜，可用于最先进的自旋电子器件，其中skyrmion本征模式通常具有GHz的频率。为了将Skyrmionics的领域扩展到更高的Skyrmion速度并克服THz间隙，上述每个目标还包括对反铁磁体中相应现象的理论预测，其中动力学是完全不同的。这将包括受控磁振子通量下的反铁磁skyrmion激发和动力学理论。这些理论与我们的铁磁skyrmion动力学的实验结果相结合，将概述如何skyrmion光谱可以扩展到反铁磁动力学固有的太赫兹范围内，为下一个周期设定目标的路径。这将激发创造和操纵反铁磁skyrmions及其动力学的新实验。

Combining expertise in theory and in Brillouin light scattering spectroscopy, we will explore the magnetic eigenmodes of skyrmions in ferro- and antiferromagnetic thin films including their excitations due to external stimuli. The main objective is to obtain a general picture for understanding and controlling magnetic excitations within single skyrmions and within skyrmion lattices. Our main experimental tool will be Brillouin light scattering spectroscopy (BLS). Regarding spin excitations in thin films, BLS excels over other existing techniques, since its high sensitivity allows for the detection of thermally excited magnetic eigenmodes of various symmetries, even from individual microstructures. BLS has evolved into one of the leading techniques for the quantification of the strength of the Dzyaloshinskii-Moriya interaction in thin films, and we will offer this experimental tool to all members of the SPP for a (comparative) analysis of their layers. The main aim of this project is to address several key issues of skyrmion excitations using a combined approach of state-of-the-art theoretical concepts, simulations and BLS experiments. The first goal will be the analysis and understanding of the thermally populated spectra of skyrmion lattices and individual skyrmions at room temperature. Here, BLS provides a unique way to access skyrmion excitations with finite wave vector. The second key goal is a comprehensive picture of linear skyrmion excitations in the presence of external stimuli. As stimuli, we will consider radiofrequency magnetic fields and spin currents. From the excited spectra, we will obtain valuable insights into the underlying processes which govern the skyrmion dynamics. As the third key issue, we will address the nonlinear skyrmion excitations arising from strong external drivings and their implications for skyrmion-based technologies like skyrmion racetrack memories or skyrmion nano-oscillators for radiofrequency applications. In our room temperature experiments, we will focus on layer systems incorporating ferromagnetic thin films which can be used in state-of-the-art spintronic devices where skyrmion eigenmodes typically feature GHz frequencies. To extend the field of skyrmionics to higher skyrmion velocities and to overcome the THz gap, each of the aforementioned goals also covers theoretical predictions for the corresponding phenomena in antiferromagnets, where dynamics are substantially different. This will include theories for antiferromagnetic skyrmion excitations and dynamics under controlled magnon fluxes. These theories in combination with our experimental results on ferromagnetic skyrmion dynamics will outline the path how skyrmion spectroscopy can be extended to the THz range inherent to antiferromagnetic dynamics which sets the goal for the next cycle. This will stimulate novel experiments on the creation and manipulation of antiferromagnetic skyrmions and their dynamics.