Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Dynamic Magneto-mechanical Behavior of Magnetization-graded Ferromagnetic Materials

  • Chen, Lei (Key Lab of Computer Vision and Intelligent Information System, Chongqing University of Arts and Sciences) ;
  • Wang, Yao (Electrical and Computer Engineering Department, University of Minnesota)
  • Received : 2014.04.07
  • Accepted : 2014.06.18
  • Published : 2014.09.30
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Abstract

This study investigates the dynamic magneto-mechanical behavior of magnetization-graded ferromagnetic materials Terfenol-D/FeCuNbSiB (MF). We measure the dynamic magneto-mechanical properties as a function of the DC bias magnetic field ($H_{dc}$). Our experimental results show that these dynamic magneto-mechanical properties are strongly dependent on the DC bias magnetic field. Furthermore, the dynamic strain coefficient, electromechanical resonance frequency, Young's moduli, and mechanical quality factor of Terfenol-D/FeCuNbSiB are greater than those of Terfenol-D under a lower DC bias magnetic field. The dynamic strain coefficient increases by a factor of between one and three, under the same DC bias magnetic field. In particular, the dynamic strain coefficient of Terfenol-D/FeCuNbSiB at zero bias achieves 48.6 nm/A, which is about 3.05 times larger than that of Terfenol-D. These good performances indicate that magnetization-graded ferromagnetic materials show promise for application in magnetic sensors.

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