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 Tb0.3Dy0.7Fe1.92(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 (HBias). The laminate showed a high ME voltage coefficient (αV) of 233 mV/Oe at the fundamental resonance frequency (fr) of 60.6 kHz under a relatively low HBiasof0.6 kOe. By controlling HBiasin the range of0.02-1.5 kOe, nonlinear tunabilities as high as 1382 and 8.6 were achieved for αVand fr, respectively, as a result of the reduced eddy-current losses and enhanced non-180 domain-wall motion-induced negative-δE 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)