Hysteresis and magnetostriction of $TbxDyyHo1−x−yFe1.95$ [112] dendritic rods Available to Purchase

The magnetization and magnetostriction of a variety of 3/16-in.-diam Laves phase rods of $TbxDyyHo1−x−yFe1.95$ grown in the form of [112] oriented dendritic compounds were measured as a function of applied magnetic field $−3000<H<3000 Oe$ and compressive stresses of 22 and 47 MPa at room temperature. Compared to Terfenol-D $(Tb0.3Dy0.7Fe1.95),$ the widely used room temperature magnetostrictive material, Ho containing alloys can have substantially lower hysteresis with only slightly lower magnetostriction. The Ho concentration was kept relatively small (⩽0.3) to avoid a substantial decrease in the magnetostriction, while the ratio of x and y was chosen to examine alloys spanning the line of minimum magnetic anisotropy. Most of the compositions have twice the Ho content of the previous study. As expected, alloys with higher Ho concentrations showed narrower hysteresis curves. The data shows that at 22 MPa, the $Tb0.28Dy0.57Ho0.15Fe1.95$ composition has a minimal (3%) loss of magnetostriction, while the hysteresis width decreased by 15%. Between 15% and 20% Ho content, the magnetostriction drops abruptly. For alloys with a fixed Ho concentration, the strain showed a peak near the expected anisotropy minimum, but the hysteresis width always increased with increasing Tb content.