Magnetostrictton of terfenol-d beat treated under compressive stress

Giant magnetostrictive materials, such as Terfenol-D, are capable of delivering strains of ~2000 ppm. One of the main drawbacks of the commonly available alloys is that they must be operated under compressive prestresses of ~10 MPa or larger to achieve these strains. Such operating conditions insure that a full 90 ° magnetic moment rotation occurs in the material under the applied magnetic fields. The objective of this paper is to report the field dependence of the magnetostriction of Terfenol-D (tb0.27Dy0.73Fe1.95) sample heat treated under various compressive stresses.