Influence of surface pinning in the domain on the Magnetization Dynamics in Permalloy Striped Domain Films

ABSTRACT We studied the influence of surface pinning on the domain structure and magnetization dynamics in permalloy stripe domain films. The effect of the pinning in the film was controlled by introducing the defects via the interface roughness of the silicon substrate. The results show that the pinning, induced by these defects, leads to the irregularity of the stripe domain and change of their local distributions. The irregular stripe domain pattern results in the weakening of magnetization resonant- frequency and intensity of the film. The results further were verified by micromagnetic simulation, confirming that the regularity and homogeneity of the stripe domain are important for the excitation of spin waves in stripe domain films. Our results show the important significance of the domain structure for the application of spin-wave propagation in magnetic films.