Giant low-frequency magnetoelectric torque (MET) effect in polyvinylidene-fluoride (PVDF)-based MET device**Project supported by the National Natural Science Foundation of China (Grant Nos. 51525103, 51522105, and 11304326), the National Key Technology Research and Development Program of China (Grant No. 2016YFA0201102), Ningbo Municipal Science and Technology Innovation Team, China (Grant No. 2015B11001), and the Ningbo Municipal Major Science and Technology Projects, China

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A polyvinylidene-fluoride (PVDF)-based magnetoelectric torque (MET) device is designed with elastic layer sandwiched by PVDF layers, and low-frequency MET effect is carefully studied. It is found that elastic modulus and thickness of the elastic layer have great influences on magnetoelectric (ME) voltage coefficient () and working range of frequency in PVDF-based MET device. The decrease of the modulus and thickness can help increase the . However, it can also reduce the working range in the low frequency. By optimizing the parameters, the giant of 320 V/cmOe (1 Oe = 79.5775 A) at low frequency (1 Hz) can be obtained. The present results may help design PVDF-based MET low-frequency magnetic sensor with improved magnetic sensitivity in a relative large frequency range.