Abstract
This paper explores the FeCoNiCuMn high-entropy alloy system, where small departures from equiatomic composition have yielded technologically interesting 300-K Curie temperatures ( $$T_{\mathrm{c}}$$ ), making them promising for magnetocaloric applications. We also demonstrate that the small deviations from equiatomic compositions do not affect the structural stability of our single-phase fcc-based solid solutions. Room-temperature Mossbauer spectroscopy measurements provide evidence for the distributed exchange interactions ( $$J_{\mathrm{ex}}$$ ) occurring between the magnetic elements, which contribute to a broadened magnetocaloric effect observed for these alloys. The average hyperfine field observed in the Mossbauer spectra decreases as the $$T_{\mathrm{c}}$$ of the alloys decrease, confirming direct current magnetic measurements. Multiple peaks in the hyperfine field distribution are interpreted considering pairwise ferromagnetic or antiferromagnetic $$J_{\mathrm{ex}}$$ between all elements except the Cu diluent as contributing to overall magnetic exchange in the alloy.
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