The Study of Magnetoimpedance Effect for Magnetoelectric Laminate Composites with Different Magnetostrictive Layers

Abstract

The rectangular magnetoelectric (ME) composites of Metglas/PZT and Terfenol-D/PZT are prepared, and the effects of a magnetostrictive layer’s material characteristics on the magnetoimpedance of ME composite are discussed and experimentally investigated. The theoretical analyses show that the impedance is not only dependent on Young’s modulus and the magnetostrictive strain of magnetostrictive material but is also influenced by its relative permeability. Compared with Terfenol-D, Metglas possesses significantly higher magnetic permeability and larger magnetostrictive strain at quite low Hdc due to the small saturation field, resulting in the larger magnetoimpedance ratio. The experimental results demonstrate that the maximum magnetoimpedance ratios (i.e., ΔZ/Z) of Metglas/PZT composite are about 605.24% and 239.98% at the antiresonance and resonance, respectively. Specifically, the maximum ΔZ/Z of Metglas/PZT is 8.6 times as high as that of Terfenol-D/PZT at the antiresonance. Such results provide the fundamental guidance in the design and fabrication of novel multifunction devices based on the magnetoimpedance effect of ME composites.

Robust magnetic energy harvesting with flexible lead-free poly(vinylidene fluoride)-Ba0.85Ca0.15Ti0.9Zr0.1O3 fibers and Metglas-based magnetoelectric composites

“…Metglas reached saturation magnetization at 117 emu g −1 as H dc was increased. 43 This is attributed to the presence of nanosized domains, which align more easily along the applied magnetic field direction, resulting in a low coercive field ( H c ) of approximately 5.6 mT (56 Oe) and high reversibility. 44 Therefore, Metglas stands out as a typical soft ferromagnetic material capable of generating substantial magnetostrictive strain at low H dc .…”

Testing and modeling of constant magnetic field cylindrical magnetoelectric sensors output characteristics

“…5. Principle of the magnetoelectric sensor [4,31] cuit [16]. It aims to determine changes in the measured resistance ∆R based on the voltage in the imbalanced branch of the circuit.…”

“…The application of the amorphous ribbon, instead of the wellestablished Terfenol-D [6,11], allows for obtaining a higher measurement resolution, which makes it sensitive to a weak magnetic field around the wire with the current. The piezoelectric tube deformation (as a reaction to the increase of the field strength) is nearly linear, induced around 0.1 µm/m magnetostrictive strain (in contrast to highly magnetostrictive Terfenol-D, which is around 2000 µm/m) [16]. Also, attaching the ribbon to the external layer of the ring (and not to the base as in [9]), enables the accurate measurement of the field inside the ring and makes the solution useful as the sensor.…”