Abstract
Abstract Nanocrystalline Fe81.3Co4Si0.5B9.5P4Cu0.7 alloy shows low coercivity (Hc 60 A/m). In terms of structure both the alloys in as-quenched state exhibit similar X-ray diffraction patterns (i.e. X-ray amorphous). Similar to low concentration of Co in the alloy, it is possible to realize a fine nanocrystalline structure made from bcc Fe-Co phase for higher concentration of Co. However, existence of a very few large sized crystals (above 100 nm) in as-quenched state enhances the Hc. A large numbers of bcc Fe(-Co) nuclei (∼2–5 nm) in as-quenched state results in a high magnetic flux density (Bs) after optimum annealing. It is possible to obtain a Bs of 1.88–1.90 T in this system but it is at the cost of an increase in Hc.
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