Bandgap tunability of surface acoustic waves in a two-dimensional magneto-electro-elastic phononic crystal

Jianying Hu,Guangying Yang,Jianke Du,Tao Shen,Minghua Zhang

doi:10.1063/5.0049717

Jianying Hu, Guangying Yang + Show 3 more

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https://doi.org/10.1063/5.0049717

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Abstract

The propagation of surface acoustic waves in two types of tunable magneto-electro-elastic phononic crystal structures is investigated, for which Terfenol-D rods are vertically deposited on the piezoelectric substrate or embedded in the piezoelectric substrate. The bandgaps of the phononic crystal structures are analyzed by using the finite element method considering the nonlinear physical characteristics of Terfenol-D under a magnetic field and compressive pre-stress. Furthermore, through a detailed discussion of the calculated results, it is shown that the bandgaps of surface acoustic waves can be enlarged and new bandgaps will appear under an appropriate magnitude of magnetic field and compressive stress. Therefore, the present numerical model may provide relevant guidance for adjusting the bandgaps of surface acoustic waves in a two-dimensional magneto-electro-elastic phononic crystal.

Highlights

Phononic crystals (PCs) are artificially designed periodic structures with spatially modulated mass density and elastic moduli, offering a possibility to adjust the acoustic wave propagation through bandgaps.1–3 Typically, these structures consist of pillar or hole inclusions deposited on a planar matrix4,5 or embedded in the substrate,6,7 respectively
We find that the width of the bandgap increases and the center frequency of the bandgap shifts to a higher frequency as the magnitude of magnetic field increases from 0 to 5 kOe
We have shown that the magneto-elastic material Terfenol-D is an excellent choice to realize tunable phononic crystals for surface acoustic waves (SAWs) with magnetic fields and compressive pre-stresses

Summary

Introduction

Phononic crystals (PCs) are artificially designed periodic structures with spatially modulated mass density and elastic moduli, offering a possibility to adjust the acoustic wave propagation through bandgaps.1–3 Typically, these structures consist of pillar or hole inclusions deposited on a planar matrix4,5 or embedded in the substrate,6,7 respectively. 2. The variations in the effective material constants for Terfenol-D affected by a magnetic field and compressive stress.

Results

Conclusion