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We have studied magnetization dynamics of a single Bi-YIG thin film by meansof the high frequency power response induced by a slot line waveguide. Multipleabsorption peaks that correspond to excitement states in magnetization dynamicsappeared without the ferromagnetic resonance (FMR) condition. The peaks werestrongly influenced by a waveguide line width and a distance between the lines.Micromagnetics simulation reveals that each line induces a local magnetizationdynamics oscillation and generates spin waves. The spin wave that propagatesfrom one of the lines interferences with the other side of local magnetizationdynamics oscillation around the other line, resulting in an amplification ofthe oscillation when they are in synchronization with each other. Thisamplification occurs at both sides of the lines by the interference. Thus, thepossible mechanism of the excitation in the magnetization dynamics oscillationis the synchronization of mutual magnetization dynamics oscillation via spinwaves. This technique resonantly excites the local magnetization dynamicswithout the FMR condition, which is applicable as a highly coherent spin wavessource.

Synchronized excitation of magnetization dynamics via spin waves in Bi-YIG thin film by slot line waveguide