Publication details

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



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

Faculty of Science

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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