Tunable magnetic properties of Cantor Alloy CrMnFeCoNi studied via Muon Spin Relaxation

High-entropy alloys, or alloys made up of five or more elements in roughly equal proportions, exhibit exceptional properties not seen in other materials. Many of these alloys are known to be magnetic, raising the possibility of unusual magnetic properties driven by the extreme chemical disorder of high-entropy alloys. However, a comprehensive understanding of the magnetism in these materials has not yet been established. Here, we report muon spin relaxation (μSR) experiments to examine the magnetic properties of the well-known Cantor alloy CrMnFeCoNi. We tested five different samples of CrMnFeCoNi with various processing treatments and compositions. We found that the temperature and uniformity of the magnetic phase transition depends strongly on the preparation and stoichiometry of the sample. We also observed a strong variation of the spin dynamics across all samples. These results demonstrate that the magnetic properties of CrMnFeCoNi can be effectively tuned via composition and mechanical treatments, laying a solid foundation for further investigation of the magnetic properties of high-entropy materials.