Demonstration of k-vector selective microscopy for nanoscale mapping of higher order spin wave modes

摘要: As a potential route towards beyond CMOS computing magnonic waveguides show outstanding properties regarding fundamental wave physics and data transmission. Here, we use time resolved scanning transmission X-ray microscopy to directly observe spin waves in permalloy with nanoscale resolution. Additionally, demonstrate an approach for k-vector selective imaging deconvolute overlapping modes real space measurements. Thereby, efficient excitation of symmetric antisymmetric modes. The profiles higher order that arise from sub-micron confinement are precisely mapped out compared analytical models. Thus, lay basis the design multimode systems general technique k-specific can also be used field magnonics.