Self-biased magnetoelectric current sensor based on SrFe12O19/FeCuNbSiB/PZT composite

Abstract This paper presents a packaged current sensor based on a SrFe 12 O 19 /FeCuNbSiB/PZT self-biased magnetoelectric (ME) cantilever. The hard magnetic material of the SrFe 12 O 19 ribbon with a large coercive field provides a huge internal magnetic field to bias the magnetostrictive FeCuNbSiB(Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 ) layers, which can increase the magnetic moment reorientation of FeCuNbSiB layers. Consequently, by coupling the vortex magnetic field around a current-carrying cable, the proposed SrFe 12 O 19 /FeCuNbSiB/PZT sensor has a large output voltage and electric current sensitivity without additional DC bias magnetic field. Experimental results demonstrate that the presented sensor has a higher sensitivity of 198.91 mV/A at 50 Hz and the induced output voltage shows a good linear relationship to the applied 50 Hz current. Also, the SrFe 12 O 19 /FeCuNbSiB/PZT sensor can distinguish small step changes of ˜0.01 A current. These results provide a significant advancement toward promising application of the trilayer self-biased ME laminate for power-line electric monitoring.