Non-standing spin-waves in confined micrometer-sized ferromagnetic structures under uniform excitation

S. Pile,1,a) T. Feggeler,2 T. Schaffers,1,b) R. Meckenstock,2 M. Buchner,1 D. Spoddig,2 B. Zingsem,2,3, V. Ney,1 M. Farle,2,4 H. Wende,2 H. Ohldag,5,6,c) A. Ney,1 and K. Ollefs2. Appl. Phys. Lett. 116, 072401 (2020); doi: 10.1063/1.5139881

A non-standing characteristic of directly imaged spin-waves in confined micrometer-sized ultrathin Permalloy (Ni80Fe20) structures is reported along with evidence of the possibility to alter the observed state by modifications to the sample geometry. Using micromagnetic simulations, the presence of the spin-wave modes excited in the Permalloy stripes along with the quasi-uniform modes was observed. The predicted spin-waves were imaged in direct space using time resolved scanning transmission x-ray microscopy, combined with a ferromagnetic resonance excitation scheme (STXM-FMR). STXM-FMR measurements revealed a non-standing characteristic of the spin-waves. Also, it was shown by micromagnetic simulations and confirmed using STXM-FMR results that the observed characteristic of the spin-waves can be influenced by the local magnetic fields in different sample geometries.