Abstract
The crystallization that occurs in amorphous metallic alloys after isothermal annealing has been studied in a number of reports. Under certain conditions however, a surface crystalline layer may be present in an otherwise amorphous ribbon. Such crystalline structures at the surface of the ribbons may result from isothermal annealing below the normal crystallization temperature or they can result if improper casting conditions are used, which could decrease the thermal contact with the casting wheel. In either case, the presence of a surface crystalline layer has a detrimental effect on the magnetic properties of the ribbons. Thus, it is important that the nature of these structures be better understood. We have used transmission electron microscopy and x-ray diffraction to characterize the crystalline surface structures which can result if quenching conditions during casting are not adequate.
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