A polymer-based magnetoelectric (ME) laminate was fabricated by sandwiching one layer of thickness-polarized, length-stretched polyvinylidene fluoride (PVDF) piezoelectric polymer between two layers of length-magnetized, epoxy-bonded Tb_(0.3)Dy_(0.7)Fe_(1.92) (Terfenol-D) pseudo-1-3 magnetostrictive particulate composite in the thickness direction, and its resonance ME effect was investigated, both experimentally and theoretically, as a function of magnetic bias field (H_(Bias)). The laminate showed a high ME voltage coefficient (α_Vy) of 233mV/Oe at the fundamental resonance frequency (f_r) of 60.6 kHz under a relatively low H_(Bias) of 0.6 kOe. By controlling H_(Bias) in the range of 0.02-1.5 kOe, nonlinear tunabilities as high as 1382 and 8.6% were achieved for α_v and f_r, respectively, as a result of the reduced eddy-current losses and enhanced non-180° domain-wall motion-induced negative-AE effect in the Terfenol-D composite layers as well as the increased compliance contribution from the PVDF polymer layer to allow the motion of non-180° domain walls in the Terfenol-D composite layers. This improved resonance ME tuning effect, together with the durable and tailorable natures, makes the laminate great promise for developing into tunable ME devices.
展开▼
