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

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 45ms(-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 x 10(-6) at 900 kA m(-1). (C) 2008 Elsevier B.V. All rights reserved.