Magnetostrictive properties of a new type of Tb-Dy-Fe-Zn Laves phase compound

摘要

The magnetostriction of (Tb-Dy)Fe_(2) Laves phase compounds, which are generally used under compressive prestress, is strongly dependent on prestress in an application range of 0-40 MPa. Magnetostriction shows an especially pronounced decline with increasing prestress in a range of 20-40 MPa. On the other hand, this tendency for magnetostriction to decrease with increasing prestress is suppressed in Tb-Dy-Fe-Zn Laves phase compounds in which Fe has been partially substituted by Zn. Under an applied magnetic field of 80 kA/m, which is the practical operating condition of actuators, magnetorestriction displays a tendency to increase under prestress of 40 MPa compared with that of nonsubstitution compounds. Additionally, the basic properties of this newly found type of Tb-Dy-Fe-Zn Laves phase magnetostrictive compound have also been identified.