Abstract
In this paper, the flexible magnetoelectric (ME) transducer consisting of FeSiB (Metglas)/poly(vinylidene fluoride) (PVDF) is presented, whose ME coupling characteristics and ME sensing performance under different bend status have been investigated. It is found that an appropriate size of transducers is propitious to the ME coupling characteristics due to the demagnetization effect. In addition, with increase the bending angle (θ) of transducers from 0° to 50°, the magnetoelectric voltage coefficient (MEVC) shows a reduction from 240.42 to 26.44 V/cm·Oe and 13.1 to 2.11 V/cm·Oe, at the resonance and low-frequency (1 kHz), respectively. Meanwhile, the induced ME voltage have an excellent linear relationship to ac magnetic field. An ultrahigh magnetic field sensitivity of 1.22 V/Oe and 0.11 V/Oe have been found under θ = 0° and 50°, respectively, which are positively comparable to the highest reported in the most recent polymer-based ME transducers. Moreover, the transducers can maintain the MEVC stable after an additionally bending cycles up to 1000 times, indicating the full flexibility and high stability of the mentioned transducers. Obviously, it demonstrates that the proposed FeSiB/PVDF transducers have great potential of being applied to wearable devices.
Highlights
ME transducers have intrigued dramatic research interests in the past decades, owing to its potential applications in a large number of new multifunctional devices including magnetic storage, energy harvesters, and magnetic field sensors.[1,2,3,4,5,6,7] Recently, with the popularity of intelligent terminals, the application of ME transducers in wearable devices have been a hot research topic due to their huge market prospects.[8]
Before investigate the ME response performance under bending conditions, the optimum Hdc and size of the FeSiB/poly(vinylidene fluoride) (PVDF) transducers have determined by optimizing the resonance magnetoelectric voltage coefficient, αME,r, values (Fig. 2)
The flexible ME transducer based on FeSiB/PVDF have been presented
Summary
ME transducers have intrigued dramatic research interests in the past decades, owing to its potential applications in a large number of new multifunctional devices including magnetic storage, energy harvesters, and magnetic field sensors.[1,2,3,4,5,6,7] Recently, with the popularity of intelligent terminals, the application of ME transducers in wearable devices have been a hot research topic due to their huge market prospects.[8]. Silva et al reported a PVDF/Vitrovac 4040 transducer which were bonded with epoxies with different elastic moduli to investigate the effect of the bonding layer type.[17] in spite of the large ME response, the MPM structure means to add an additional layer of epoxy resin. It will reduce the flexibility of transducers, which may make it not sufficient for a broader area of application. Such selection is related with the high piezomagnetic coefficient, magnetic permeability, and large saturation magnetostrictive coefficient (almost reach 27 ppm) of the FeSiB, together with the low dielectric losses, soft elastic constants, high resistivity, and highest piezoelectric voltage coefficient among polymers of the PVDF.[19]
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