Tunability of Band Gaps of Programmable Hard-Magnetic Soft Material Phononic Crystals

In this paper, the elastic wave band gap characteristics of two-dimensional hard-magnetic soft material phononic crystals (HmSM-PnCs) under the applied magnetic field are studied. Firstly, the relevant material parameters of hard-magnetic soft materials (HmSMs) are obtained by the experimental measurement. Then the finite element model of the programmable HmSM-PnCs is established to calculate its band structure under the applied magnetic field. The effects of some factors such as magnetic field, structure thickness, structure porosity, and magnetic anisotropy encoding mode on the band gap are given. The results show that the start and stop frequencies and band gap width can be tunable by changing the magnetic field. The magnetic anisotropy encoding mode has a remarkable effect on the number of band gaps and the critical magnetic field of band gaps. In addition, the effect of geometric size on PnC structure is also discussed. With the increase of the structure thickness, the start and stop frequencies of the band gap increase.

Automated summary

This paper investigates the characteristics of two-dimensional hard-magnetic soft material phononic crystals (HmSM-PnCs) under applied magnetic field, finding that the band gap can be controlled by changing the magnetic field, and the magnetic anisotropy encoding mode has a significant effect on the number of band gaps and critical magnetic field.