Detection of pico-Tesla magnetic fields using magneto-electric sensors at room temperature

摘要

The measurement of low-frequency (10~(-2)-10~3 Hz) minute magnetic field variations (10~(-12) Tesla) at room temperature in a passive mode of operation would be critically enabling for deployable neurological signal interfacing and magnetic anomaly detection applications. However, there is presently no magnetic field sensor capable of meeting all of these requirements. Here, we present new bimorph and push-pull magneto-electric laminate composites, which incorporate a charge compensation mechanism (or bridge) that dramatically enhances noise rejection, enabling achievement of such requirements.