Abstract
In recent years, magnetic sensors based on the magnetoelectric (ME) coupling effect have made remarkable progress in the detection of an ac magnetic field, but the detection of the dc magnetic field is still a challenging issue. Therefore, our work aims to develop a highly sensitive device for measuring the dc magnetic field. The designed ME device is based on a pair of highly consistent ME sensors and an intelligent differential configuration. By applying a strong driving ac magnetic field, the even-order harmonic components of the output voltage can be eliminated, and the odd-order harmonic components are superimposed concurrently. Due to the high responsivity (149 mV/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{T}$ </tex-math></inline-formula> ) of the first harmonic component to the dc magnetic field, we obtained a low detection limit of 0.8 nT for the dc magnetic field. These results further advance the research of ME composites used in dc field detection. This ME device may play an important role in many fields of magnetic field detection, such as magnetic localization, magnetic navigation, and so on.
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