AC/DC Magnetic Field Sensing Utilizing Mechanically Mediated Product Effect of Ampere Force Caused by Eddy Currents and Piezoelectricity in a Magnetoelectric Disk

摘要

The last two decades have witnessed an ever-increasing research effort devotedto the development and application of magnetoelectric (ME) sensing composites.Herein, the ME effect in a metallic/polymeric composite fabricated by adheringsilver electrodes to two surfaces of one poly(vinylidine fluoride) (PVDF) disk isexplored. To obtain obvious ME response, the resonance frequency of theexperimental setup is measured. Furthermore, it is proved that the ME couplingin the composite (silver/PVDF/silver) originates from the product effect of thepiezoelectric effect and ampere force produced by eddy currents under DC biasmagnetic fields. By observing measurement results, the ME voltage is approximatelyconsidered to be proportional to both AC and DC magnetic fields.Consequently, the average ME voltage coefficient is obtained as 384.73 mV cm~（-1）Oe at a DC magnetic field value of 1000 Oe. Considering the magnetic fields andeddy current, a theoretical model of ME coupling is developed by combining theampere force expression and piezoelectric equations, which matches well withmeasurement results. Without the need of magnetic phase and an external powersupply, the proposed disk with excellent linear responses and a considerable MEvoltage coefficient has the potential for application in real-time monitoringsensors.