Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Focus Session: Magnetism in Materials Science: Thermodynamics, Kinetics and Defects III (joint session MM/MA)

MA 22.3: Vortrag

Dienstag, 13. März 2018, 12:30–12:45, H 0106

Magnetic properties of the CrMnFeCoNi high-entropy alloy — Oldřich Schneeweiss¹, •Martin Friák^1,2, Marie Dudová¹, David Holec³, Mojmír Šob^2,1,4, Dominik Kriegner⁵, Václav Holý⁵, Přemysl Beran⁶, Easo-P. George⁷, Jörg Neugebauer⁸, and Antonín Dlouhý¹ — ¹Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czech Republic — ²Central European Institute of Technology, CEITEC MU, Masaryk University, Brno, Czech Republic — ³Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Leoben, Austria — ⁴Department of Chemistry, Faculty of Science, Masaryk University, Brno, Czech Republic — ⁵Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — ⁶Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež, Husinec, Czech Republic — ⁷Institute for Materials, Ruhr University, Bochum, Germany — ⁸Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

The equiatomic CrMnFeCoNi high-entropy alloy undergoes a paramagnetic-to-spin-glass transition at 93 K and a ferromagnetic transition at 38 K while maintaining its fcc structure down to 3 K (Phys. Rev. B 96 (2017) 014437). We study the local atomic magnetic moments in this material by ab initio calculations. We find the Cr magnetic moments aligning antiferromagnetically with respect to a cumulative magnetic moment of their first coordination shell. The magnetic moments of Fe and Mn atoms remain high (between 1.5 and 2 µ_B), while the local moments of Ni atoms effectively vanish.