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

0522096 - FZÚ 2020 RIV NL eng J - Journal Article
Kamarád, Jiří - Friák, Martin - Kaštil, Jiří - Schneeweiss, Oldřich - Šob, Mojmír - Dlouhý, Antonín
Effect of high pressure on magnetic properties of CrMnFeCoNi high entropy alloy.
Journal of Magnetism and Magnetic Materials. Roč. 487, Oct (2019), s. 1-9, č. článku 165333. ISSN 0304-8853. E-ISSN 1873-4766
R&D Projects: GA ČR(CZ) GA14-22834S; GA MŠMT(CZ) LQ1601; GA MŠMT(CZ) LM2018096
Institutional support: RVO:68378271 ; RVO:68081723
Keywords : high entropy alloy * CrMnFeCoNi * magnetization * high pressure
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Condensed matter physics (including formerly solid state physics, supercond.) (UFM-A)
Impact factor: 2.717, year: 2019
Method of publishing: Limited access
https://doi.org/10.1016/j.jmmm.2019.165333

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, 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 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.
Permanent Link: http://hdl.handle.net/11104/0306597