Magnetic field anomaly detector using magnetoelectric composites

摘要

This study reports the low frequency magnetoelectric (ME) response of the sintered composites comprising of a piezoelectric phase Pb(Zr_(0.52)Ti_(0.48))O_(3) (PZT) and magnetostrictive phases NiFe_(1.9)Mn_(0.1)O_(4) (NFM) and Ni_(0.8)Zn_(0.2)Fe_(2)O_(4) (NZF) with varying ferrite contents of 3, 5, 10, 15, and 20 mol percent. It was found that the ME coefficient for the PZT-NZF samples shows considerably less scattering as a function of frequency and the composition 0.8PZT-0.2NZF exhibited a flat response in the range of 10-100 Hz with a magnitude of 220 mV/cm Oe. This composition was used to design the magnetic field anomaly detector mounted in front of a global positioning system (GPS) controlled vehicle. The results from the vehicle test clearly demonstrate the feasibility of using sintered ME composites for magnetic field detection in the noisy environment.