Structural and magnetic investigations of high-entropy alloys for potential sensor applications

FeNiCrMnAl alloys, as part of the high-entropy alloy (HEA) family, provide a unique platform to study the coupling of structure and magnetism in multi-component systems. Their near-equiatomic composition typically stabilizes body-centered cubic (BCC) or mixed BCC–FCC structures, where Al addition enhances lattice distortion and mechanical strength. Alongside these structural features, their magnetic properties are highly tunable: Fe and Ni drive ferromagnetic ordering, while Mn and Cr tend to suppress it, yielding a spectrum of magnetic behaviors ranging from ferromagnetic to nearly paramagnetic states. This combination of structural robustness and magnetic versatility positions FeNiCrMnAl alloys as promising candidates for applications requiring mechanical and functional properties. Here, we investigate three different compositions by comparing the synthesis formulation with a laser elemental analyzer and corroborate the data with their magnetic properties. The results reveal that these HEA alloys offer excellent prospects for high-quality and cost-effective sensor applications.