Magnetostriction and magnetization process of Tb0.27Dy0.73Fe2 single crystal

The magnetostriction, dynamic strain coefficient and magnetization process of a [111] oriented twin-free Tb0.27Dy0.73Fe2 single crystal along the [1 1 1], [1 1 2] and [1 1 0] directions were investigated by strain gauge, lock -in amplifier, double coiled induction and Bitter Colloid techniques. it is found that a 'jump' effect of magnetostriction along [1 1 (1) over bar] an d [2 (1) over bar 1] directions occurs at a particular field and no 'jump' effect occurs in the direction of [0 1 1]. The value of the magnetostrictio n along [1 1 (1) over bar] direction is higher than that along [2 (1) over bar 1] direction and the 'jump' field for [1 1 (1) over bar] direction is m uch lower than that for [2 (1) over bar 1] direction. The magnetization pro cess and dynamic strain coefficient, d(33), of the Tb0.27Dy0.73Fe2 single c rystal along the [1 1 1], [1 1 2] and [1 1 0] directions were also discusse d. The [1 1 1] oriented twin-free Tb0.27Dy0.73Fe2 single crystal possesses excellent magnetostrictive properties along the rod direction ([1 1 1]) in low magnetic fields and it is very useful in applications of industry. (C) 2000 Elsevier Science B.V. All rights reserved.