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Lecture

Fine-tuning low-temperature response of the FeCoCrMnNi high-entropy alloy by field-assisted cooling

Thursday (27.09.2018)
09:15 - 09:30 S1/03 - 283
Part of:


We present experimental data showing that the equiatomic CrMnFeCoNi high-entropy alloy undergoes two magnetic transformations at temperatures below 100 K while maintaining its fcc structure down to 3 K. The first transition, paramagnetic to spin glass, was detected at 93 K and the second transition of the ferromagnetic type occurred at 38 K. Field-assisted cooling below 38 K resulted in a systematic vertical shift of the hysteresis curves. Strength and direction of the associated magnetization bias was proportional to the strength and direction of the cooling field and shows a linear dependence with a slope of 0.006 ± 0.001 emu/T. This phenomenon allows for manipulating the low-temperature magnetic response of the material via thermo-magnetic treatment. Lastly, as a complement to our experiments and as an attempt to explain the detected effects, local magnetic moments of individual atoms in the CrMnFeCoNi quinary fcc random solid solution were investigated by quantum-mechanical (electronic density functional theory) calculations (for details see Physical Review B 96 (2017) 014437).

Speaker:
Dr. Martin Friak
Czech Academy of Sciences
Additional Authors:
  • Dr. Oldřich Schneeweiss
    Czech Academy of Sciences
  • Dr. Marie Dudová
    Czech Academy of Sciences
  • Prof. David Holec
    Montanuniversität Leoben
  • Prof. Dr. Mojmír Šob
    Masaryk University
  • Dr. Dominik Kriegner
    Charles University
  • Prof. Dr. Václav Holý
    Charles University
  • Dr. Přemysl Beran
    Czech Academy of Sciences
  • Prof. Dr. Easo-P. George
    Oak Ridge National Laboratory
  • Prof. Dr. Jörg Neugebauer
    Max-Planck-Institut für Eisenforschung GmbH
  • Prof. Dr. Antonín Dlouhý
    Czech Academy of Sciences