Temperature and stress dependences of the magnetostriction in ternary and quaternary Terfenol alloys

The magnetization and magnetostriction of a variety of Laves phase rods of TbxDyyHo1−x−yFe1.95 grown in the form of [112] oriented dendritic platelets were measured as a function of magnetic field H(−2200<H<2200 Oe), compressive stress (20, 30, and 40 MPa), and temperature T(−60<T<80 °C). Compared to Terfenol-D (Tb0.3Dy0.7Fe1.95), Ho containing alloys can have lower hysteresis with only slightly lower magnetostriction. Sample compositions were chosen both along a line of minimum near room-temperature anisotropy (Tb0.3Dy0.7Fe1.95–Tb0.20Dy0.22Ho0.58Fe1.95) and at Ho0.15 and Ho0.30 across the line.