Quasi-static (f< 10~(-2) Hz) frequency response of magnetoelectric composites based magnetic sensor

摘要

In this paper, we present a quasi-static charge amplifier method to detect the extremely low frequency response of Metglas/Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 magnetoelectric (ME) laminated composites. Using this technique, ME effect can be detected at/< 10~(-2) Hz, and ME charge coefficients show good stability over wide frequency range from 10 mHz to 1 kHz. Thus, it allows us to develop a quasi-static magnetic sensor based on ME composites which can work at frequencies as low as 10 mHz, with equivalent magnetic noise floors of about 3 nT/√Hz.