Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 24: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 4
MM 24.1: Topical Talk
Mittwoch, 7. September 2022, 15:45–16:15, H45
Electromigration effects on the atomic ordering process in hard magnetic L10 intermetallic phases — •Daniel Urban1,2 and Christian Elsässer1,2 — 1Fraunhofer-Institut für Werkstoffmechanik IWM, Wöhlerstraße 11, 79108 Freiburg — 2Freiburger Materialforschungszentrum, Stefan-Meier-Straße 21, 79104 Freiburg
High-performance permanent magnets are needed for many applications in energy and information technology. The L10 phase of FeNi is a promising candidate for a sustainable material that is free of rare-earth elements. However, on earth FeNi can only be found in the disordered A1 crystal structure, although the layered L10 structure is lower in energy. By contrast, the latter was found in meteorites, proving the astronomical long timescales required for the dynamical ordering of the material.
We investigate the atomic migration processes in binary intermetallic L10 phases within the framework of density functional theory. Our main objectives are (i) to develop a thorough understanding of the possibilities to enhance the thermally activated diffusion processes at the atomic scale by electric fields and currents and (ii) an assessment in how far electromigration effects can be effective in processing hard magnetic materials. We extend the scope to the hard magnetic L10 phases of FePt, FePd, MnAl and MnGa as well as ternary Fe(Pt,Ni). These alloys cover a wide range of thermal ordering time scales and related experimental feasibilities.