AlCoFeNiCu_x (x=0.6-3.0) high-entropy alloys (HEAs) are a new class of magnetically soft alloys that demonstrate zero-magnetostriction and have potential for use in supersilent AC magnetic applications. These HEAs have desirable mechanical and magnetic properties, making them suitable for use in aerospace, automotive, and electrical engineering.

A comprehensive analysis of the magnetic properties of AlCoFeNiCu_x HEAs was published in "Advanced Materials Interfaces" [1]. The study showed that the addition of Cu to the AlCoFeNi system improves magnetic properties, including increased magnetic permeability, saturation, and anisotropy. At a specific concentration of Cu, the material exhibits zero-magnetostriction, making it ideal for low-noise applications in motors and generators. The alloys also have high thermal stability and maintain magnetic properties over a wide temperature range.

Microstructural analysis revealed that the alloys' superior magnetic properties come from a three-phase structure that leads to zero magnetostriction. The magnetostrictions of individual phases compensate each other, some having positive and some negative values.

In conclusion, our study evaluates the magnetic properties and potential applications of AlCoFeNiCu_x HEAs for supersilent devices. Results highlight the alloys' exceptional magnetic properties, high thermal stability, and unique microstructures, making them suitable for low-noise industrial applications.

[1] J. Luzar, P. Priputen, S. Vrtnik, et al., Adv. Mater. Interfaces 2201535 (2022).