Molecular-dynamics simulations on the crystallization of Fe metallic glasses under alternating magnetic field

YX Wu and QQ Pan and R Ning and HL Peng, CHINESE PHYSICS B, 34, 076402 (2025).

DOI: 10.1088/1674-1056/adcb25

We performed the coupled molecular-dynamics and spin dynamics simulations to investigate the magnetic annealing effect on the crystallization behavior of Fe metallic glasses (MGs). By calculating the local five-fold symmetry, Voronoi polyhedron, and bond orientational order parameters, we find a significant structural evolution at high- frequency magnetic annealing: the icosahedral order diminishes, and the crystalline-like order is enhanced, comparing to the case without magnetic field. The fraction of the body-centered cubic structures remarkably increases with the frequency of magnetic annealing, and the atoms of these order show a tendency of aggregating in space to form the crystalline nuclei. These findings unveil how the local structure evolves under magnetic annealing, and the accelerated crystallization process of MGs through alternating magnetic fields.

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