Competing spin wave emission mechanisms revealed by time-resolved x-ray microscopy

摘要: Spin wave emission and propagation in magnonic waveguides represent a highly promising alternative for beyond-CMOS computing. It is therefore all the more important to fully understand underlying physics of process. Here, we use time-resolved scanning transmission x-ray microscopy directly image formation process globally excited local spin waves permalloy waveguide at nanoscale. Thereby, observe from corner as well oscillation domain-wall-like structure within waveguide. Additionally, an isofrequency contour analysis used explain origin quasicylindrical excitation its concurrent nonreflection nonrefraction domain interface. This study complemented by micromagnetic simulations which perfectly fit experimental findings. Thus, clarify fundamental question mechanisms lay basis future operations.