Tunable dispersion relations manipulated by strain in skyrmion-based magnonic crystals

Abstract

In this paper, we theoretically investigated the propagation characteristics of spin waves in skyrmion-based magnonic crystals. It is found that the dispersion relations can be manipulated by strains through magneto-elastic coupling. Especially, the allowed bands and forbidden bands in dispersion relations shifted to higher frequency with changing strains from compressive to tensile, while shifting to lower frequency with changing strains from tensile to compressive. We also confirmed that the spin waves with specific frequencies could pass the magnonic crystal or be blocked by tuning the strains. The result provides an advanced platform for tunable skyrmion-based spin wave devices.