Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

Alice Perrin; Scott McCall; Michael McElfresh; David E. Laughlin; Michael E. McHenry

doi:10.1007/s11669-021-00920-x

Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

Alice Perrin, Scott McCall, Michael McElfresh, David E. Laughlin, Michael E. McHenry

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

6 Scopus citations

Abstract

We report the pressure (P) dependent Curie temperature, T_c (P) in a FeCoNiCuMn high entropy alloy (HEA). We analyze T_c (P) in terms of d-orbital contraction to explain changes in magnetic exchange interactions (J_ex). Considerations of the d-radius contraction inferred from the composition dependence of T_c in γ-Fe-Ni are combined with experimental data for P-dependent lattice constants and magnetic measurements of T_c (P), to calculate contributions of atomic spacing and d-orbital radii to J_ex. We show the d-orbital contraction with P captures most of the T_c variation in this alloy.

Original language	English
Pages (from-to)	617-622
Number of pages	6
Journal	Journal of Phase Equilibria and Diffusion
Volume	42
Issue number	5
DOIs	https://doi.org/10.1007/s11669-021-00920-x
State	Published - Oct 2021
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 Alex Leary at NASA Glenn Space Center for measurement assistance. Work at LLNL prepared under Contract DE-AC52-07NA27344 and was supported by the LLNL-LDRD Program under Project No. 20-ER-059. 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 Alex Leary at NASA Glenn Space Center for measurement assistance. Work at LLNL prepared under Contract DE-AC52-07NA27344 and was supported by the LLNL-LDRD Program under Project No. 20-ER-059.

Funders	Funder number
Lawrence Livermore National Laboratory	20-ER-059
National Science Foundation	DMR-1709247, DE-AC52-07NA27344
National Aeronautics and Space Administration
Carnegie Mellon University

Keywords

calculations
experimental phase equilibria
first principles
material properties
metallic alloys
multicomponent
solid solution

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abstract = "We report the pressure (P) dependent Curie temperature, Tc (P) in a FeCoNiCuMn high entropy alloy (HEA). We analyze Tc (P) in terms of d-orbital contraction to explain changes in magnetic exchange interactions (Jex). Considerations of the d-radius contraction inferred from the composition dependence of Tc in γ-Fe-Ni are combined with experimental data for P-dependent lattice constants and magnetic measurements of Tc (P), to calculate contributions of atomic spacing and d-orbital radii to Jex. We show the d-orbital contraction with P captures most of the Tc variation in this alloy.",

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AU - McHenry, Michael E.

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AB - We report the pressure (P) dependent Curie temperature, Tc (P) in a FeCoNiCuMn high entropy alloy (HEA). We analyze Tc (P) in terms of d-orbital contraction to explain changes in magnetic exchange interactions (Jex). Considerations of the d-radius contraction inferred from the composition dependence of Tc in γ-Fe-Ni are combined with experimental data for P-dependent lattice constants and magnetic measurements of Tc (P), to calculate contributions of atomic spacing and d-orbital radii to Jex. We show the d-orbital contraction with P captures most of the Tc variation in this alloy.

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KW - material properties

KW - metallic alloys

KW - multicomponent

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Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

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