Magnetostriction and magnetic anisotropy of field annealed Metglas* 2605 alloys via dc M-H loop measurements under stress

Amorphous metallic ribbons annealed in transverse fields have enormous magnetoelastic coupling. An integrating magnetometer was used to measure magnetization M as a function of applied field H and tensile stress T in such ribbons, from which is determined the magnetostriction λs. A simple phenomenological model of moment rotation can account for the linear dependence of M as a function of H at T below 7×105 Pa observed in Metglas 2605SC. From the model we extract λs∼27×10−6 and anisotropy K∼38 J/M3. In stressed 2605CO no linear behavior is observed. This work substantiates previous high values obtained for the coupling factor and ΔE effect.