Magnetostrictive properties of rapidly quenched Tb-Dy-Fe-B alloys

The magnetostriction of melt-spun ribbons of the alloys (R/sub 0.33/Fe/sub 0.67/)/sub 1-x/B/sub x/ (R=Tb/sub 0.3/Dy/sub 0.7/ and 0/spl les/x/spl les/0.06) is investigated as a function of wheel speed during melt-quenching. The low field sensitivity of magnetostriction with magnetic field is found to be good for the alloys with x/spl les/0.04 over a wide range of wheel speed. This magnetostrictive behavior is in contrast with that observed previously for Dy-Fe and Tb-Fe based alloys and is thought to be due to low intrinsic magnetocrystalline anisotropy of the compound.