Features of relaxation modes in soft magnetic metallic glasses and their correlation with magnetic ordering

Although the anneal-induced relaxation process of Fe-based metallic glasses has been widely reported, there is a lack of a systematic description of the relaxation modes of atoms. In this work, the relaxation modes of FeSiBPC metallic glasses and their relationship with magnetic ordering have been investigated. A two-stage relaxation behavior has been observed, and the pinning effect of Curie temperature is found in the first stage. The shortrange ordering involved in the beta relaxation in the first stage is confined and facilitated by magnetic ordering. It causes a smaller E beta compared to that of non-magnetic metallic glasses. In the second stage, the pinning effect disappears. It is mainly the medium-range rearrangements involved in alpha relaxation that begins to yield the influence on magnetic ordering. This work uncovers the inner magnet-influenced beta relaxation in Fe-based metallic glasses and provides insights into the interaction between structural arrangement during relaxation and magnetic ordering.

Automated summary

This study reveals the magnet-influenced beta relaxation in Fe-based metallic glasses and its interaction with magnetic ordering, and finds a two-stage relaxation behavior with the pinning effect of Curie temperature in the first stage and its disappearance in the second stage.