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Home > Issues > RetrieveA High-sensitivity Passive Magnetic Transducer Based on PZT Plates and a Fe-Ni Fork Substrate
(College of Optoelectronic Engineering, Chongqing University), Yumei Wen (College of Optoelectronic Engineering, Chongqing University), Chaobo Jia (College of Optoelectronic Engineering, Chongqing University), Xinshen Li (College of Optoelectronic Engineering, Chongqing University) This paper proposes a magnetoelectric (ME) composite transducer structure consisting of a magnetostrictive Htype Fe-Ni fork substrate and piezoelectric PZT plates. The fork composite structure has a higher ME voltage
coefficient compared to other ME composite structures due to the higher quality (Q) factor. The ME sensitivity
of the fork structure reaches 12 V/Oe (i.e., 150 V/cm Oe). The fork composite with two PZT plates electrically
connected in series exhibits over 5 times higher ME voltage coefficient than the output of the rectangle
structure in the same size. The experiment shows the composite of a Fe-Ni fork substrate and PZT plates has a significantly enhanced ME voltage coefficient and a higher ME sensitivity relative to the prior sandwiched composite laminates. By the use of a lock-in amplifier with 10 nV resolution, this transducer can detect a weak
magnetic field of less than 10−12 T. This transducer can also be designed for a magnetoelectric energy harvester due to its passive high-efficiency ME energy conversion.
