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MM: Fachverband Metall- und Materialphysik
MM 3: Transport - Atoms and Ions I
MM 3.2: Vortrag
Montag, 16. März 2020, 10:30–10:45, IFW A
A DFT study of the electric field dependence of atomic migration barriers in hard magnetic L10 intermetallic phases — •Oskar Till1 and Christian Elsässer1,2 — 1Freiburger Materialforschungszentrum FMF, Stefan-Meier-Straße 21, 79104 Freiburg — 2Fraunhofer IWM, Wöhlerstraße 11, 79108, Freiburg
We examine the effect of an external electric field on migration barriers of atoms near surfaces in ferromagnetic binary L10 intermetallics. Using DFT surface-slab models for various surface configurations we study hops of atoms in the vicinity of the crystal surface. We are especially interested in the transition from the disordered A1 phase to the ordered L10 phase of FeNi, a promising candidate for a rare-earth-free high performance hard magnetic material. The aims are an assessment in how far electromigration effects can be effective in processing hard magnetic materials, as well as a better understanding of electromigration in intermetallic phases. Hence we extend the scope to the L10 phases of FePt, MnAl and MnGa. These four alloys cover a wide range of thermal ordering time scales and related experimental feasibilities. The investigations are part of a joint project ’Processing magnetic materials enhanced by electric fields or currents’ in the DFG SPP 1959 ’Fields Matter’.