A multipeak phenomenon of magnetoelectric coupling in Terfenol-D/P(VDF-TrFE)/Terfenol-D laminates

The magnetoelectric (ME) coupling in Terfenol-D/P(VDF-TrFE)/Terfenol-D laminate is investigated as a function of the applied static magnetic field (Hs) and the frequency of the alternating magnetic field. A three-dimensional surface chart of ME coefficients (αME) versus Hs and frequency of the alternating magnetic field is drawn. The landscape highlights three strings of resonance peaks and an additional peak corresponding to the maximum of the piezomagnetic coefficient d11,m of the Terfenol-D plate. Based on the constitutive relations of Terfenol-D, the resonances are found to be caused by the mechanical oscillation of the magnetic layer under the applied alternating magnetic field. The ferromagnetic resonance frequency can be tuned by varying Hs. Finite element simulations fit well with the experimental data. That enables us to conclude that three resonance modes correspond to oscillations in length-, width-, and biaxial directions, respectively.