Quality factor, static and dynamic responses of miniature galfenol actuator at wide range of temperature

Mojtaba Ghodsi*, Mehdi Modabberifar, Toshiyuki Ueno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


In this research, galfenol (iron-gallium alloy) is exploited to make a miniature actuator. The relationship between displacement and the applied current is measured. Furthermore, the dynamic behaviors of the actuator in wide range of temperature from cryogenic environment (77 K) to room temperature (RT) are investigated numerically and experimentally. Although, the length of galfenol bar is 10 mm and the maximum strain of annealed galfenol bar is 200 ppm, the large displacements of 37 and 25 μm are achievable at RT and 77 K, respectively when the coil is energized by ±1 A. The natural frequency of this actuator at RT and 77K is 1015 and 1075 Hz, respectively. Furthermore, modal analysis predicts the natural frequency of the actuator by maximum 9% error. Low hysteresis behavior makes this actuator suitable for positioning at both, RT and 77 K. It is also found that the low quality factor of actuator at RT is related to Joule heat dissipation.

Original languageEnglish
Pages (from-to)8143-8150
Number of pages8
JournalInternational Journal of Physical Sciences
Issue number36
Publication statusPublished - Dec 30 2011


  • Cryogenic environment
  • Galfenol (iron-gallium alloy)
  • Miniature actuator
  • Modal analysis
  • Quality factor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy(all)


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