Narrow hysteresis of magnetostriction in <110> oriented (TbDyHo) Fe2 alloys

The (Tb_0.36Dy_0.64)_1-x Ho_xFe₂ magnetostrictive alloys with <110> orientation were prepared by zone melting directionally solidified method. The magnetostrictive performance and hysteresis of <110> aligned polycrystalline (Tb_0.36Dy_0.64)_1-x Ho_xFe₂ under compressive stresses of 0, 5, 10 MPa were investigated. An obvious magnetostriction 'jump' effect under compressive stress was observed in these <110> aligned polycrystalline (Tb_0.36Dy_0.64)_1-x Ho_xFe₂ samples. The (Tb_0.36Dy_0.64)_1-x Ho_xFe₂ alloys (x < 0.3) has the character of giant magnetostriction in a wide operating temperature range from -60 to 80°C. The hysteresis, represented by the width of magnetostriction versus the applied field, was reduced dramatically due to the addition of Ho element. Compared to the Tb_0.36Dy _0.64 Fe _1.95 alloy (x = 0) with hysteresises of 10.4, 13.5, 16.6 kA/m under compressive stresses of 0, 5, 10 MPa, the magnetostriction hysteresises reduced to 9.3, 11.6, 13.7 kA/m for x = 0.1; to 7.5, 10.8, 12.9 kA/m for x = 0.2 and to 5.4, 8.8, 9.8 kA/m for the alloy with x = 0.3, respectively.