Cryogenic Effects in the Amorphous Curie Temperature Shift of Fe-based Glassy Alloys

Abstract

Continuing the earlier experiments, a series of new effects will be presented in this paper which demonstrate, that the amorphous Curie temperature (T ^am_C ) can be altered by resting the samples at low temperature such as (liquid N₂, 77 K). The sign and magnitude of this shift depends on the alloy composition, but can also be influenced by the rate of liquid quench applied during the ribbon formation. T ^am_C is lowered during liquid N₂ treatments for the binary Fe₈₅B₁₅ glass. The effect is the same when a small amount of Si is added to the Fe₈₅B₁₅. Exceeding the critical concentration limit of the Si, the sign of T ^am_C changes.