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Acta Mechanica Solida Sinica

, Volume 21, Issue 1, pp 15–18 | Cite as

Magnetomechanical behaviors of giant magnetostrictive materials

  • Xu Gao
  • Yongmao Pei
  • Daining Fang
Article

Abstract

The Laves phase alloy Tb-Dy-Fe, commercially known as Terfenol-D, exhibits the giant room-temperature magnetostriction at moderate field strength of a few kOe due to its combination of high magnetostriction and low magnetocrystalline anisotropic energy. Thus, this pseudobinary rare earth iron compound has found quite a number of applications such as in magnetomechanical transducers, actuators and adaptive vibration control systems. The simultaneous measurements of magnetostriction and magnetization at various fixed compressive pre-stresses applied in the axial direction for Tb0.3Dy0.7Fe1.95 samples are presented. The results show that the magnetostriction increases with increasing compressive stress until it reaches 1742 × 106 under 25 MPa, so does the coercive magnetic field. And the hysteresis loop area for magnetization and magnetostriction also increases with the increment of applied compressive stresses. But the maximum magnetic susceptibility χ(dM/dH) is obtained under zero stress field and the strain derivative dλ/dH increases to the highest amplitude of 0.039 × 10−6 A−1m at a stress level of 5 MPa. In the strain versus magnetization intensity curve, the initial flat stage mainly consisting of a 180° domain wall motion becomes shorter with increasing stress. It means more initial domains are driven to the transversal direction under the compressive stress before magnetization, which is consistent with the improvement of the magnetostriction.

Key words

magnetization magnetostriction ferromagnetic materials magnetomechanical coupling 

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2008

Authors and Affiliations

  • Xu Gao
    • 1
  • Yongmao Pei
    • 2
  • Daining Fang
    • 1
  1. 1.Department of Engineering MechanicsTsinghua UniversityBeijingChina
  2. 2.School of ScienceBeijing Institute of TechnologyBeijingChina

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