Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Dynamic Magneto-mechanical Behavior of an Iron-nickel-based Ferromagnetic Alloy with Constant Elasticity

  • Bian, Leixiang (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) ;
  • Li, Ping (College of Optoelectronic Engineering, Chongqing University, The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education) ;
  • Gao, Qiuling (College of Optoelectronic Engineering, Chongqing University, The Key Laboratory for Optoelectronic Technology & Systems, Ministry of Education) ;
  • Liu, Xianxue (Institute of Electronic Engineering, China Academy of Engineering Physics)
  • Published : 2009.06.30
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Abstract

The dynamic magneto-mechanical behaviors in a type of iron-nickel-based ferromagnetic alloy with constant elasticity were investigated as a function of both the DC bias magnetic field ($H_{dc}$) and the frequency. The rectangular plate-like samples were excited to vibrate at a half-wavelength, longitudinal resonance by an AC magnetic field superimposed with various $H_{dc}$. The experimental results found that the strain coefficient at resonance reached 819.34 nm/A and the effective mechanical quality factor ($Q_m$) was greater than 2000. The ratio of the maximum variation of the Young's modulus over $H_{dc}$ to the value of the Young's modulus at a zero bias field was only ${\sim}0.83%o$ because of the so-called constant elasticity. The resonant strain coefficients and $Q_m$ are strongly dependent on $H_{dc}$, which indicates a promising potential for use in DC and quasistatic magnetic field sensing.

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