Study of the transmission properties of piezoelectric/piezomagnetic phononic composite laminates

In the present work, the transmission characteristics of piezoelectric/piezomagnetic phononic composite laminates with and without a defect layer are predicted using the plane wave expansion and the stiffness matrix methods. The energy transmission and reflection spectrums show the appearance of two band gaps. The effect of the variation of the thickness of the epoxy layer on the transmission characteristics is also discussed. In addition, a passband can be produced and controlled within the band gap when inserting a defect layer. The effect of magnetoelectric constants, piezoelectric e₁₅ constant with piezoelectric defect layer (BaTiO₃) as well as q₁₅ piezomagnetic constant with piezomagnetic defect layer (CoFe₂O₄) on transmission coefficient is further studied. These findings could be relevant to understanding the intrinsic physical properties of phononic piezoelectric-piezomagnetic composite laminate and provide flexible choices to meet real engineering applications.