Magnetoelectric macro fiber composite

Abstract

This paper describes the fabrication and performance results of a magnetoelectric macro fiber composite (ME MFC). The magnetoelectric composite was fabricated by bonding a magnetostrictive layer to a piezoelectric layer using a novel approach of low temperature transient liquid phase (LTTLP) bonding. The composite was diced into 150 micron wide fibers and bonded to a custom designed copper flexible circuit using a spin coated low viscosity room temperature curing epoxy. ME MFC's with varying ferrite thicknesses of 0.6 mm and 0.5 mm were fabricated and characterized for energy harvesting. The composite with 0.6mm ferrite thickness achieved an open circuit voltage of 101 mV (ME voltage coefficient of 6740 mV/cmOe) and peak power of 3.1 nW across 356 kΩ matching load at 264 Hz.

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“…Thus, applying a magnetic field, the magnetic material suffers a strain that will generate an electrical voltage in the piezoelectric phase (magnetoelectric effect) . The energy harvesting generated by these type of systems is very low, with some nano- to μW of power. , For their lower power compared with other energy harvesting systems, magnetoelectric laminates and composites are more used as sensors . Commercial magnetostrictive materials typically used for this application are Vitrovac (Fe 39 Ni 39 Mo 4 Si 6 B 12 ), Terfenol-D (Tb 0.3 Dy 0.7 Fe 1.9–2 ), and Metglas (Fe 81 B 13.5 Si 3.5 C 2 ), which are usually used with a piezoelectric polymer, most often PVDF and copolymers. , The magnetoelectric effect is quantified by the magnetoelectric coefficient ( a ME ) described in eq : α ME = V ME × ( t p × H AC ) − 1 where V ME is the induced magnetoelectric voltage, t p is the thickness of the piezoelectric material, and H AC is the applied magnetic field …”

“…315 The energy harvesting generated by these type of systems is very low, with some nano-to μW of power. 296,316 For their lower power compared with other energy harvesting systems, magnetoelectric laminates and composites are more used as sensors. 296 Commercial magnetostrictive materials typically used for this application are Vitrovac (Fe 39 Ni 39 Mo 4 Si 6 B 12 ), Terfenol-D (Tb 0.3 Dy 0.7 Fe 1.9−2 ), and Metglas (Fe 81 B 13.5 Si 3.5 C 2 ), which are usually used with a piezoelectric polymer, most often PVDF and copolymers.…”