Title: Circumferential-mode, quasi-ring-type, magnetoelectric laminate composite—a highly sensitive electric current and∕or vortex magnetic field sensor
Abstract: A quasi-ring-type magnetoelectric (ME) laminate composite consisting of a circumferentially poled piezoelectric Pb(Zn1∕3Nb2∕3O)3-4.5at.%PbTiO3single-crystal ring and two circumferentially magnetized magnetostrictive TERFENOL-D rings was fabricated and found to have a giant ME voltage coefficient of 2.2V∕Oe, or equivalently a ME field coefficient of 5.5V∕cmOe, over the frequency range of 0.5<f<105Hz. This circumferential-mode quasiring ME laminate can detect ac currents (noncontact) as small as 10−7A, and∕or a vortex magnetic field as small as 6×10−12Tesla. In addition, we demonstrated current sensing capability of the quasiring laminate in a power electronics module.