Surface effects on the coercive force of rapidly solidified Fe-Pr-B alloys

Melt-spun ribbons of Fe
76
Pr
16
B
8
quenched at intermediate rates can show hign coercivities as prepared, with lower H
ci
at faster and slower rates. For any given wheel speed, the structure of such ribbons varies through the thickness because the cooling rate varies. The corresponding variation of H
ci
through the thickness can be demonstrated by etching the ribbons from one surface or the other.