Mössbauer analysis of compositional tuning of magnetic exchange interactions in high entropy alloys

Alice Perrin; Monica Sorescu; Vishal Ravi; David E. Laughlin; Michael E. McHenry

doi:10.1063/1.5079744

Mössbauer analysis of compositional tuning of magnetic exchange interactions in high entropy alloys

Alice Perrin, Monica Sorescu, Vishal Ravi, David E. Laughlin, Michael E. McHenry

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

16 Scopus citations

Abstract

We measured the change in the average hyperfine field strength of several high entropy alloys in relation to small compositional deviations from the equiatomic alloy, FeCoNiCuMn. Mössbauer spectra of four psuedo-binary systems, in which Mn content is increased and another element was decreased in equal measure, reveal several discrete peaks in the hyperfine field distribution that show evidence of the discrete exchange interactions between magnetic elements in the alloy. A simple linear regression modelling the perturbation of the average hyperfine field when the composition is altered calculates the contribution of each atom to the overall average. The average hyperfine field is linear with T_c, so these values allow us to estimate T_c for alloys with more complex compositional variation within the window of linearity (<24% Mn based on other alloys). The results were confirmed experimentally by calculating T_c of two new alloys, Fe₁₉Co₂₀Ni₁₉Cu₁₉Mn₂₃ and Fe₁₉Co₂₀Ni₁₉Cu₂₀Mn₂₂.

Original language	English
Article number	035329
Journal	AIP Advances
Volume	9
Issue number	3
DOIs	https://doi.org/10.1063/1.5079744
State	Published - Mar 1 2019
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 Data Storage Systems Center at CMU. We thank Vladimir Keylin at NASA Glenn Space Center for measurement assistance.

Funders	Funder number
National Science Foundation	DMR-1709247, 1709247

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title = "M{\"o}ssbauer analysis of compositional tuning of magnetic exchange interactions in high entropy alloys",

abstract = "We measured the change in the average hyperfine field strength of several high entropy alloys in relation to small compositional deviations from the equiatomic alloy, FeCoNiCuMn. M{\"o}ssbauer spectra of four psuedo-binary systems, in which Mn content is increased and another element was decreased in equal measure, reveal several discrete peaks in the hyperfine field distribution that show evidence of the discrete exchange interactions between magnetic elements in the alloy. A simple linear regression modelling the perturbation of the average hyperfine field when the composition is altered calculates the contribution of each atom to the overall average. The average hyperfine field is linear with Tc, so these values allow us to estimate Tc for alloys with more complex compositional variation within the window of linearity (<24% Mn based on other alloys). The results were confirmed experimentally by calculating Tc of two new alloys, Fe19Co20Ni19Cu19Mn23 and Fe19Co20Ni19Cu20Mn22.",

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AU - McHenry, Michael E.

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AB - We measured the change in the average hyperfine field strength of several high entropy alloys in relation to small compositional deviations from the equiatomic alloy, FeCoNiCuMn. Mössbauer spectra of four psuedo-binary systems, in which Mn content is increased and another element was decreased in equal measure, reveal several discrete peaks in the hyperfine field distribution that show evidence of the discrete exchange interactions between magnetic elements in the alloy. A simple linear regression modelling the perturbation of the average hyperfine field when the composition is altered calculates the contribution of each atom to the overall average. The average hyperfine field is linear with Tc, so these values allow us to estimate Tc for alloys with more complex compositional variation within the window of linearity (<24% Mn based on other alloys). The results were confirmed experimentally by calculating Tc of two new alloys, Fe19Co20Ni19Cu19Mn23 and Fe19Co20Ni19Cu20Mn22.

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Mössbauer analysis of compositional tuning of magnetic exchange interactions in high entropy alloys

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