The effects of the soft magnetic alloys' material characteristics on resonant magnetoelectric coupling for magnetostrictive/piezoelectric composites

摘要

The resonant magnetoelectric (ME) effects are investigated in Terfenol-D/PZT laminates with various soft magnetic alloys (i.e. FeCuNbSiB, FeSiB and CoNiFeSiB). The soft magnetic alloys with high magnetic permeability and magnetization produces an additional magnetostatic field in the Terfenol-D, which changes the effective magnetic field distribution within the Terfenol-D and plays an important role at the large zero bias ME response. Meanwhile, the magnetostrictive strain of soft magnetic alloys can produce a pre-stress on the Terfenol-D layer due to its low saturation field, which enhances the maximum ME voltage coefficient and reduces the required optimal dc magnetic field H-opt,H-dc. The experimental results indicate that the largest zero bias ME voltage coefficient is obtained for Terfenol-D/PZT composite with FeCuNbSiB (i.e. the soft magnetic alloy with the highest magnetization), which is about 7.3 times more than that of Terfenol-D/PZT at zero bias. The maximum ME voltage coefficient is obtained for Terfenol-D/PZT composite with FeSiB (i.e. the soft magnetic alloy with the largest magnetostriction constant) at H-opt,H-dc = 175 Oe, which is about 1.15 times greater than that of Terfenol-D/PZT composite (at H-opt,H-dc = 598 Oe) and also happens at a much smaller bias field.