High-Entropy Alloys Show Surprising Superparamagnetic Behavior

By Surbhi JainAug 19 2022Reviewed by Susha Cheriyedath, M.Sc. In an article recently published in The Journal of Physical Chemistry C, researchers discussed the unexpected superparamagnetic behavior in nanocrystalline high-entropy alloys based on Niobium.

High-entropy or multi-principal element alloys , which may meet the requirements of future aerospace, energy, and nuclear technologies, have recently received the greatest attention in the evolution sequence. Initially, the idea of high-entropy alloys was solely applicable to metallic materials or alloys.

Even though there have been few attempts to document the controlled growth and microstructure of nanostructured high-entropy alloys, it has been difficult to demonstrate high-entropy alloy nanoparticles with ultra-narrow size distribution and improved functionality. The team demonstrated the superparamagnetic properties of the refractory high-entropy alloy nanoparticles by magnetic measurements taken in cryogenic and ambient temperatures. While the magnetic domain size followed the opposite trend, the saturation magnetization value increased exponentially with milling duration and stabilized after 8 hours of pulverization.

Conclusions and Future Perspectives In conclusion, this study showed that the refractory high-entropy alloy nanoparticles exhibited unexpected superparamagnetic properties in contrast to their bulk equivalent. The magnetic domain size differed significantly between the bulk and the nanoscaled refractory high-entropy alloy samples. The superparamagnetic behavior of the nanoscaled samples was caused by the shrinkage of the magnetic domain size.

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