ABSTRACT
This chapter provides demonstrations of exciting new physics and technological opportunities associated with the graded magnonic index and spin wave Fano resonances, highlighting them as the next big thing in magnonics research. It shows that the concepts of graded magnonic index and spin wave Fano resonances are relevant to each of the constituents. The chapter demonstrates the interesting physics and highlights technical opportunities associated with the graded magnonic index and spin wave Fano resonances. To excite propagating spin waves, it is necessary to perturb the magnetization both quickly and locally, so that the frequency and wave vector of the spin wave to be excited are covered by the spectrum of the perturbation. The dispersion is different for each branch and depends on the film thickness, which suggests the continuous variation of the thickness and/or width as a means by which to control the spin wave propagation in patterned magnetic structures.
