Magnetic properties of equiatomic CrMnFeCoNi

TL;DR

This study investigates the magnetic, structural, and thermodynamic properties of the equiatomic CrMnFeCoNi alloy across a wide temperature and magnetic field range, revealing intrinsic magnetic transitions and processing history effects.

Contribution

It provides new insights into the intrinsic magnetic transitions and processing effects in the CrMnFeCoNi alloy, combining experimental measurements with ab initio calculations.

Findings

Identification of two intrinsic magnetic transitions at 43K and 85K.

Evidence of processing history dependence affecting magnetic properties.

Detection of significant electron-electron interactions and Stoner enhancement.

Abstract

Magnetic, specific heat, and structural properties of the equiatomic Cantor alloy system are reported for temperatures between 5 kelvin and 300 kelvin, and up to fields of 70 kilo-oersted. Magnetization measurements performed on as-cast, annealed, and cold-worked samples reveal a strong processing history dependence and that high-temperature annealing after cold-working does not restore the alloy to a pristine state. Measurements on known precipitates show that the two transitions, detected at 43 kelvin and 85 kelvin, are intrinsic to the Cantor alloy and not the result of an impurity phase. Experimental and ab initio density functional theory (DFT) computational results suggest that these transitions are a weak ferrimagnetic transition and a spin-glass-like transition, respectively, and magnetic and specific heat measurements provide evidence of significant Stoner enhancement and electron-electron interactions within the material.