Nanocrystalline CoCrFeNiMn high-entropy alloy with tunable ferromagnetic properties

A nanocrystalline CoCrFeNiMn high-entropy alloy (nc-HEA) with nano-multiphase structure was prepared by inert gas condensation (IGC) using a laser evaporation source. Encouragingly, the laser-IGC nc-HEA exhibits unexpected ferromagnetic behavior and the Curie temperature (T-c) increased nearly 10 times compared to any CoCrFeNiMn HEAs prepared by various other methods. In addition, the saturation magnetization (M-s) and T-c of the laser-IGC nc-HEA can be controlled via heat treatment, which is resulting from the formation and structural evolution of magnetic nanophases during annealing. This work widens the design toolbox for high-performance nc-HEAs based upon laser-IGC technique. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

A nanocrystalline CoCrFeNiMn high-entropy alloy with nano-multiphase structure was prepared by laser evaporation source using inert gas condensation, exhibiting unexpected ferromagnetic behavior and significantly increased Curie temperature. The saturation magnetization and Curie temperature of the alloy can be controlled through heat treatment, attributed to the formation and structural evolution of magnetic nanophases during annealing, expanding the design toolbox for high-performance nc-HEAs based on laser-IGC technique.