The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys

Alice Perrin; Monica Sorescu; Mari Therese Burton; David E. Laughlin; Michael McHenry

doi:10.1007/s11837-017-2523-3

The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys

Alice Perrin, Monica Sorescu, Mari Therese Burton, David E. Laughlin, Michael McHenry

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

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_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 Mössbauer spectroscopy measurements provide evidence for the distributed exchange interactions (J_ex) occurring between the magnetic elements, which contribute to a broadened magnetocaloric effect observed for these alloys. The average hyperfine field observed in the Mössbauer spectra decreases as the T_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_ex between all elements except the Cu diluent as contributing to overall magnetic exchange in the alloy.

Original language	English
Pages (from-to)	2125-2129
Number of pages	5
Journal	JOM
Volume	69
Issue number	11
DOIs	https://doi.org/10.1007/s11837-017-2523-3
State	Published - Nov 1 2017
Externally published	Yes

Funding

The authors acknowledge support from the National Science Foundation (NSF) through Grant DMR-1709247. The authors also acknowledge use of the Materials Characterization Facility at Carnegie Mellon University supported by Grant MCF-677785. We thank Vladimir Keylin and William Hasley III for sample preparation and assistance.

Funders	Funder number
Vladimir Keylin and William Hasley III
National Science Foundation	DMR-1709247, MCF-677785, 1709247
Carnegie Mellon University

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abstract = "This paper explores the FeCoNiCuMn high-entropy alloy system, where small departures from equiatomic composition have yielded technologically interesting 300-K Curie temperatures (Tc), 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 M{\"o}ssbauer spectroscopy measurements provide evidence for the distributed exchange interactions (Jex) occurring between the magnetic elements, which contribute to a broadened magnetocaloric effect observed for these alloys. The average hyperfine field observed in the M{\"o}ssbauer spectra decreases as the Tc of the alloys decrease, confirming direct current magnetic measurements. Multiple peaks in the hyperfine field distribution are interpreted considering pairwise ferromagnetic or antiferromagnetic Jex between all elements except the Cu diluent as contributing to overall magnetic exchange in the alloy.",

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The Role of Compositional Tuning of the Distributed Exchange on Magnetocaloric Properties of High-Entropy Alloys

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