Sandwich magnetoelectric composites of polyvinylidene fluoride, Tb-Dy-Fe alloy, and lead zirconate titanate

Abstract

The novel sandwich composites were prepared by sandwiching a polyvinylidene fluoride/Tb-Dy-Fe alloy composite (PVDF/Terfenol-D) between polyvinylidene fluoride/lead zirconate titanate composites (PVDF/PZT). The maximum magnetoelectric effect voltage coefficient, (dE/dH)_33max, of the sandwich composites is higher than that of three-phase composites at their own optimal loading level of Terfenol-D. This is attributed to less interface relaxations of strain and better polarization of the sandwich composites. When the volume fraction of Terfenol-D is higher than 0.10, no coupling interaction for three-phase composites could be observed, but (dE/dH)_33max of sandwiched composites still reached 20 mV/(cm·Oe). At high magnetic field intensity, the magnetoelectric effect voltage coefficient, (dE/dH)₃₃, of sandwich composites is higher than that of three-phase composites; at low magnetic field intensity, (dE/dH)₃₃ of sandwich composites is lower than that of three-phase composites. At their resonance frequency, the (dE/dH)_33max of the sandwich composites and the three phase composites are 150 mV/(cm·Oe) and 42 mV/(cm·Oe), respectively. This significant increase of (dE/dH)_33max at resonance frequency confirms the improvement of maximum magnetoelectric effect coefficient via sandwich-structured composites.

Keywords

magnetoelectric / piezoelectric / sandwiched composites

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