Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Dynamic Magnetostriction Characteristics of an Fe-Based Nanocrystalline FeCuNbSiB Alloy

  • Chen, Lei (College of Optoelectronic Engineering, Chongqing University, The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education) ;
  • Li, Ping (College of Optoelectronic Engineering, Chongqing University, The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education) ;
  • Wen, Yumei (College of Optoelectronic Engineering, Chongqing University, The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education)
  • Received : 2011.03.25
  • Accepted : 2011.07.28
  • Published : 2011.09.30
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Abstract

The dynamic magnetostriction characteristics of an Fe-based nanocrystalline FeCuNbSiB alloy are investigated as a function of the dc bias magnetic field. The experimental results show that the piezomagnetic coefficient of FeCuNbSiB is about 2.1 times higher than that of Terfenol-D at the low dc magnetic bias $H_{dc}$ = 46 Oe. Moreover, FeCuNbSiB has a large resonant dynamic strain coefficient at quite low Hdc due to a high mechanical quality factor, which is 3-5 times greater than that of Terfenol-D at the same low $H_{dc}$. Based on such magnetostriction characteristics, we fabricate a new type of transducer with FeCuNbSiB/PZT-8/FeCuNbSiB. Its maximum resonant magnetoelectric voltage coefficient achieves ~10 V/Oe. The ME output power reaches 331.8 ${\mu}W$ at an optimum load resistance of 7 $k{\Omega}$ under 0.4 Oe ac magnetic field, which is 50 times higher than that of the previous ultrasonic-horn-substrate composite transducer and it decreases the size by nearly 86%. The performance indicate that the FeCuNbSiB/PZT-8/FeCuNbSiB transducer is promising for application in highly efficient magnetoelectric energy conversion.

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