Core structure of dislocations in ordered ferromagnetic FeCo

A Egorov and A Kraych and M Mrovec and R Drautz and T Hammerschmidt, PHYSICAL REVIEW MATERIALS, 8, 093604 (2024).

DOI: 10.1103/PhysRevMaterials.8.093604

We elucidated the core structure of screw dislocations in ordered B2 FeCo using a recent magnetic bondin B2 FeCo exist in pairs separated by antiphase boundaries. The equilibrium separation is about 50 & Aring;, which demands large-scale atomistic simulations-inaccessible for density functional theory but attainable with BOP. We performed atomistic simulations of these separated dislocations with BOP and predicted that they reside in degenerate core structures. Additionally, dislocations induce changes in the local electronic structure and magnetic moments.

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