Abstract
A theoretical model has been developed for predicting the magnetoelectric (M-E) coupling effect of magnetostrictive-piezoelectric layered composites (MPLC). This model determines the individual effects of MPLC configurations and material properties on the homogenized M-E voltage coefficient, α ', curves. By analyzing the model, a 3D α' sequencing map covering the span of compliance, Poisson's ratio, and piezomagnetic coefficient ratio q33/q31 of the magnetostrictive phases is generated to aid the MPLC design. Six MPLC configurations are addressed in this study, including three field orientations, longitudinal, transverse, and in-plane, in both 1D and 2D geometries. Results show that the piezoelectric volume fraction required for achieving the maximum M-E effect is dependent upon the compliance. Higher compliance values cause the α' peaks to be attenuated, as well as shifted to lower piezoelectric volume fractions. This study also investigates the influence of the piezomagnetic coefficient q33 and the ratio q33/q31 on α' . For a constant ratio q33/q31, larger q 33-values increase α'. However, changing this ratio alters the relative ordering of the α'-values for each of the six MPLC configurations studied. This demonstrates that the ratio q33/q 31 strongly influences the selection of the MPLC configurations to produce the largest M-E coupling effect. By integrating the results from this model into 3D α' sequencing map, the ideal MPLC configuration with the highest M-E coupling effect can be predicted for all possible MPLC magnetostrictive phases.
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