Magnetic anisotropy determined by differential magnetization measurements in twisted amorphous ribbons

A new method of measurement, which enables a determination of the in-plane anisotropy in magnetic metallic glass ribbons, has been developed. It can be used for materials with the easy axis of magnetization parallel as well as perpendicular to the ribbon axis. The method is based on measurements of the stress dependence of the inhomogeneous magnetization obtained by twisting the ribbon around the ribbon axis. The required experimental equipment is very simple, and the value of the anisotropy constant comes out directly as an equivalent internal stress field.