Enhancing the magnetoelectric response of Metglas/polyvinylidene fluoride laminates by exploiting the flux concentration effect

Abstract

Magnetic flux concentration effect of Metglas as a function of its sheet aspect ratio was investigated for Metglas/polyvinylidene fluoride laminates. Taking advantage of this effect, the magnetoelectric voltage coefficient of 21.46 V/cm∙Oe for a laminate with 1 mm wide and 30 mm long Metglas sheet (25 μm thick) is achieved, which is much higher than those reported earlier in similar laminates without making use of the flux concentration effect. The results demonstrate an effective means to significantly enhance the sensitivity of magnetostrictive/piezoelectric composite laminates as weak magnetic field sensors.

Local magnetization and strain in single magnetoelectric microrod composites

“…In particular, the nanofocus diffraction studies show that the MS strain changes induced in the PE component can indeed be enhanced in such structures, as suggested by previous more macroscopic ME measurements. 2,26,27 The initial strain and also the field induced changes in the ZnO are localized near the Metglas/ZnO interface, with the latter being well correlated with the magnetization behavior observed by MOKE microscopy. The possibility to determine in single ME microcomposites both the magnetization and strain changes in the 10 À5 range with micron spatial resolution, as demonstrated in this work, is crucial for understanding these complex systems and will also be highly useful for studies of other similar functional microsystems.…”

Near-flat self-biased magnetoelectric response in geometry gradient composite

“…For adjusting the self-biased ME response, it was found that high magnetic flux concentration in the magnetic phase has positive effect. 11,14 By considering the influence of demagnetization effect, the effective magnetic flux density can be expressed as 11…”

Improved magnetoelectric effect in magnetostrictive/piezoelectric composite with flux concentration effect for sensitive magnetic sensor

“…[1][2][3][4][5][6] For obtaining a more sensitive magnetic sensor, the magnetostrictive phase in the laminate composite is recommended to have higher effective relative permeability µ r and lower saturation magnetization µ 0 M s . 7,8 But unfortunately, most of the magnetostrictive materials have low µ r . 9,10 Recently, the ME composites with Metglas have highest sensitivity and lowest noise for ME sensors.…”