Abstract
A study about the magnetic anisotropy and magnetostriction in ribbons of composition Fe81Al19 and Fe70Al30 obtained by the melt spinning technique is presented. The hysteresis loops indicate that the easy magnetization direction lies in both cases on the plane of the ribbon. Torque magnetometry measurements show that the in-plane magnetic anisotropy constant results 10100Jm−3 and 490Jm−3 for the Fe81Al19 and Fe70Al30 respectively. After a thermal treatment of 2h at 473K to remove the residual stresses, the in-plane magnetic anisotropy constants falls down to 2500Jm−3 in the first composition and remains the same in the second one, while the easy direction remains the same.Measurements of the magnetostriction and the residual stresses of both ribbons allow us to explain the above mentioned results about the magnetic anisotropy and to conclude that the residual stresses via magnetostriction are the main source of magnetic anisotropy in the case of Fe81Al19 ribbon but they do not influence this property in the ribbon of composition Fe70Al30.
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