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Title: Magnetic properties of the CrMnFeCoNi high-entropy alloy

In this paper, 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. The local magnetic moments of individual atoms in the CrMnFeCoNi quinary fcc random solid solution were investigated by ab initio (electronic density functional theory) calculations. Results of the numerical analysis suggest that, irrespective of the initial configuration of local magnetic moments, the magnetic moments associated with Cr atoms align antiferromagnetically with respect to a cumulative magnetic moment of their first coordination shell. The ab initio calculations further showed that the magnetic moments of Fe and Mn atoms remain strong (between 1.5 and 2 μ B), while the local moments of Ni atoms effectively vanish. Finally, thesemore » results indicate that interactions of Mn- and/or Fe-located moments with the surrounding magnetic structure account for the observed macroscopic magnetization bias.« less
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [8] ;  [1]
  1. Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials
  2. Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials; Masaryk Univ., Brno (Czech Republic). Central European Inst. of Technology
  3. Montanuniversitat Leoben (Austria). Dept. of Physical Metallurgy and Materials Testing
  4. Academy of Sciences of the Czech Republic, Brno (Czech Republic). Inst. of Physics of Materials; Masaryk Univ., Brno (Czech Republic). Central European Inst. of Technology. Dept. of Chemistry
  5. Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics
  6. Academy of Sciences of the Czech Republic, Husinec (Czech Republic). Nuclear Physics Inst.
  7. Ruhr Univ., Bochum (Germany). Inst. for Materials
  8. Max Planck Inst. for Iron Research, Dusseldorf (Germany)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; GA14-22834S; RVO:68081723; LQ1601; LM2015069; LM2015070; LM2015085; LM2015042; CZ.02.1.01/0.0/0.0/15.003/000045
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Academy of Sciences of the Czech Republic, Brno (Czech Republic); Charles Univ., Prague (Czech Republic); Masaryk Univ., Brno (Czech Republic); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Czech Science Foundation (Czech Republic); Academy of Sciences of the Czech Republic; Ministry of Education, Youth and Sports of the Czech Republic; European Regional Development Fund (ERDF) (Belgium)
Contributing Orgs:
Ruhr Univ., Bochum (Germany); Max Planck Inst. for Iron Research, Dusseldorf (Germany); Montanuniversitat Leoben (Austria)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ferromagnetism; first-principles calculations; magnetic phase transitions; magnetism; magnetoresistance; paramagnetism
OSTI Identifier:
1376503
Alternate Identifier(s):
OSTI ID: 1373323