Magnetomechanical behaviors of giant magnetostrict

Authors: Xu Gao Yongmao Pei Daining Fang

Publish Date: 2008/02/01

Volume: 21, Issue: 1, Pages: 15-18

PDF Link

Abstract

The Laves phase alloy TbDyFe commercially known as TerfenolD exhibits the giant roomtemperature 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 prestresses applied in the axial direction for Tb03Dy07Fe195 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 χdM/dH is obtained under zero stress field and the strain derivative dλ/dH increases to the highest amplitude of 0039 × 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

Keywords: