Publication details

Effect of high pressure on magnetic properties of CrMnFeCoNi high entropy alloy

Authors

KAMARAD J. FRIÁK Martin KASTIL J. SCHNEEWEISS O. ŠOB Mojmír DLOUHY A.

Year of publication 2019
Type Article in Periodical
Magazine / Source Journal of Magnetism and Magnetic Materials
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S0304885319313666
Doi http://dx.doi.org/10.1016/j.jmmm.2019.165333
Keywords High entropy alloy; CrMnFeCoNi; Magnetization; High pressure
Description The temperature and magnetic field dependences of magnetization of the Cantor CrMnFeCoNi alloy were studied at ambient and high (up to 1 GPa) external pressure. The low-temperature spin-glass-like behavior and the paramagnetic behavior at temperatures above 100 K with effective paramagnetic moment of the alloy, m(eff )= 2.71 mu(B)/f.u., were observed. A negative value of the paramagnetic Curie temperature, theta(c) = - 210 K, was found that confirms a presence of strong antiferromagnetic interactions of moments in the alloy. A model of the magnetic clusters with the effective moment of m(cl) = 0.275 mu(B)/f.u. provides a possibility to describe qualitatively the pronounced difference between the pressure-induced decrease of magnetization of the ZFC and the FC alloys, dlnM/dP(5 K) = - 15.5*10(-3) GPa(-1) and - 39.2*10(-3) GPa(-1), respectively. The former value is in an excellent agreement with the value of - 16*10(-3) GPa(-1) obtained from our quantum-mechanical calculations. The negative pressure shift of the ordering temperature of the alloy, dT(ord)/dP = - 9 K/GPa, and the pressure-induced decrease of magnetization of the alloy in paramagnetic state, dlnM/dP(90 K) = -70*10(-3) GPa(-1), indicate a possible itinerant character of magnetism of the alloy. The results of theoretical calculations of the total moment of the CrMnFeCoNi fcc-alloy are discussed.
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