Abstract
Magnetic sensors based on nonlinear magnetoelectric (ME) effect can be used to measure weak dc and ac magnetic fields at room temperature. The focus of this paper is to present the nonlinear ME effect of parallel-placed dual FeNiMoSiB/PZT/FeNiMoSiB composites with small size which are operated in 180° anti-phase modulated mode and differential output configuration. In this design, the strong ME voltage at even order harmonics due to frequency doubling effect of magnetostriction is greatly attenuated. This is of great benefit to the design of the sensor signal conditioning circuit because strong even order harmonics limit the magnification of the first stage amplifier. Due to the nonlinear ME effect, the induced ME voltage of the odd order harmonics is modulated by a weak dc/ac magnetic field to be measured. The wideband frequency of weak magnetic field from dc-0.9f (f is the frequency of the driving field) can be recovered from the 1 st harmonic response by the lock-in demodulation method. The sensitivity and limit of detection of the anti-phase modulated differential ME dual-unit are 176.1 μV/μT and 2 nT/√Hz at 10 Hz, respectively.
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