Abstract
Amorphous ribbons of composition Fe85.2-xCoxSi0.5B9.5P4Cu0.8 (x=0at% and 4at%) have been flash annealed for 10s at temperatures between 350°C and 540°C. Above about 400°C a nanocrystalline state of bcc Fe(Co) is formed with a crystalline fraction of 50–55% and grain sizes of about 16–18nm. The optimum nanocrystalline state reveals a saturation polarization up to Js=1.82T–1.83T and a coercivity as low as 3–5Am−1. The present paper complements the so far missing magnetostriction data for these alloys. Magnetostriction decreases from initially 40ppm in the as cast amorphous state to about 14ppm (x=0at%) and 19ppm (x=4at%), respectively, after formation of the fully developed nanocrystalline state.
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