Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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A High-sensitivity Passive Magnetic Transducer Based on PZT Plates and a Fe-Ni Fork Substrate

  • Li, Ping (The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education, China College of Optoelectronic Engineering, Chongqing University) ;
  • Wen, Yumei (The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education, China College of Optoelectronic Engineering, Chongqing University) ;
  • Jia, Chaobo (The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education, China College of Optoelectronic Engineering, Chongqing University) ;
  • Li, Xinshen (The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education, China College of Optoelectronic Engineering, Chongqing University)
  • Received : 2011.05.31
  • Accepted : 2011.06.29
  • Published : 2011.09.30
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Abstract

This paper proposes a magnetoelectric (ME) composite transducer structure consisting of a magnetostrictive H-type 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.

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References

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