Tunable asymmetric transmission of flexural waves in the dual-layer magnetoelastic metasurfaces by modulating magnetic field

In this paper, we have established a design of dual-layer magnetoelastic metasurfaces and achieved the tunable asymmetric transmission of flexural waves by modulating magnetic field. Relying on the adjustable phase shift of flexural waves with a full 2[Formula: see text] range by applied different magnetic fields, the asymmetric transmission of flexural waves (i.e., asymmetric refraction and asymmetric focusing) can be realized without altering the structure based on the generalized Snell’s law. The results show that the proposed magnetoelastic metasurfaces exhibit the asymmetric refraction of flexural waves with the tunable working frequencies and incident angles. In addition, the asymmetric focusing of flexural waves can also be modulated by adjusting magnetic loading. The proposed magnetoelastic metasurfaces can provide a new way for actively controlling the asymmetric transmission of elastic waves, further broadening the potential applications in the field of vibration control as a dynamic tunable diode.