Structure and magnetic properties of melt-spun Tb0.27Dy0.73Fex ribbons

Abstract The structure and magnetic properties of the melt-spun ribbons of Tb 0.27 Dy 0.73 Fe x alloy are investigated as a function of various wheel speeds during melt-quenching using a single-roll technique. It is found that Tb 0.27 Dy 0.73 Fe x alloy is difficult to be fabricated as amorphous state by using the melt-quenching method. X-ray diffractions show that all these ribbons for x =1.7−2.0 are the MgCu 2 -type phase at the wheel speed of 45 m s −1 . For Tb 0.27 Dy 0.73 Fe x alloy, the high wheel speed is beneficial to eliminate the RFe 3 phase and form the perfect MgCu 2 -type phase. Compared with the bulk of Tb 0.27 Dy 0.73 Fe 1.95 , these ribbons exhibit higher intrinsic coercivity value and their saturation magnetizations increase as well. The magnetostriction of Tb 0.27 Dy 0.73 Fe 1.95 composite with 4% epoxy resin is 640×10 −6 at 900 kA m −1 .