Magnetic characteristics of highly ductile 70% Co-Fe splat cooled ribbons

Ribbon-shaped 70% Co-Fe alloy was formed by a rapid quenching method with a single roller. Magnetic and mechanical measurements were made on the ribbon after annealing in a dry hydrogen gas atmosphere. The ribbon was very flexible; could be wound around a rod with 1 mm diameter, could put up with repeated bending, and could be bent 180° upon itself. The saturation magnetostriction was as high as 70×10^-6, Curietemperature was 875°C and the saturation flux density was as high as 2.2 T. The magnetostriction activity of the ribbon was improved and attained 3×10¹⁰. The pulse voltage induced in the ribbon by acexciting was sufficiently high and was linear to frequency and bias field.