S. Mayr, J. Förster, S. Finizio, K. Schultheiss, R. A. Gallardo, R. Narkovicz, G. Dieterle, A. Semisalova, J. Bailey, E. Kirk, A. Suszka, J. Lindner, J. Gräfe, J. Raabe, G. Schütz, M. Weigand, H. Stoll, S. Wintz
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引用次数: 0
摘要
时间分辨 X 射线显微镜在低阿尔法同步加速器运行模式下,以前所未有的时间和空间分辨率组合对自旋动力学进行成像。因此,在具有自旋漩涡基态的铁磁薄膜微元素中,可以直接观测到波长低至 70 纳米、频率高达 30 千兆赫的纳米级自旋波。在反平行铁磁双层系统中,我们探测到了光学和声学模式的传播,后者甚至表现出很强的非互易性。在单层系统中,我们观测到了准均匀自旋波和高阶(最高达 4 阶)模式,它们在薄膜厚度上具有前序节点。此外,我们还通过实验确定了磁性材料特性、薄膜厚度和磁场对自旋波谱的影响。我们的实验结果与微磁理论的数值计算结果一致,甚至在这些迄今为止尚未探索的时间和长度尺度上也是如此。
Time-resolved x-ray imaging of nanoscale spin-wave dynamics at multi-GHz frequencies using low-alpha synchrotron operation
Time-resolved x-ray microscopy is used in a low-alpha synchrotron operation mode to image spin dynamics at an unprecedented combination of temporal and spatial resolution. Thereby, nanoscale spin waves with wavelengths down to 70 nm and frequencies up to 30 GHz are directly observed in ferromagnetic thin film microelements with spin vortex ground states. In an antiparallel ferromagnetic bilayer system, we detect the propagation of both optic and acoustic modes, the latter exhibiting even a strong non-reciprocity. In single-layer systems, quasi-uniform spin waves are observed together with modes of higher order (up to the 4th order), bearing precessional nodes over the thickness of the film. Furthermore, the effects of magnetic material properties, film thickness, and magnetic fields on the spin-wave spectrum are determined experimentally. Our experimental results are consistent with numerical calculations from a micromagnetic theory even on these so-far unexplored time- and length scales.
期刊介绍:
Applied Physics Reviews (APR) is a journal featuring articles on critical topics in experimental or theoretical research in applied physics and applications of physics to other scientific and engineering branches. The publication includes two main types of articles:
Original Research: These articles report on high-quality, novel research studies that are of significant interest to the applied physics community.
Reviews: Review articles in APR can either be authoritative and comprehensive assessments of established areas of applied physics or short, timely reviews of recent advances in established fields or emerging areas of applied physics.