Experimental determination of the temperature- and phase-dependent elastic constants of FeRh

D. Ourdani; A. Castellano; A. K. Vythelingum; J. A. Arregi; V. Uhlir; B. Perrin; M. Belmeguenai; Y. Roussigne; C. Gourdon; M. J. Verstraete; L. Thevenard

doi:10.1103/PhysRevB.110.014427

Experimental determination of the temperature- and phase-dependent elastic constants of FeRh

D. Ourdani, A. Castellano, A. K. Vythelingum, J. A. Arregi, V. Uhlir, B. Perrin, M. Belmeguenai, Y. Roussigne, C. Gourdon, M. J. Verstraete, L. Thevenard

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

Abstract

The elastic constants of an epitaxial film of FeRh have been determined experimentally in both ferromagnetic (FM) and antiferromagnetic (AF) phases, using a combination of Brillouin light scattering and picosecond acoustics experiments. The C11 constant is noticeably larger in the FM phase than in the AF phase, while C12 and C44 are both lower, leading to larger Rayleigh wave velocities in the FM phase than in the AF phase. The elastic constants were calculated numerically using first-principles anharmonic modeling and machinelearned interatomic potentials. We find that using a temperature-dependent effective potential is indispensable to correctly reproduce the experimental values to within 80-100%. The accurate knowledge of the temperatureand phase-dependences of the elastic constants of crystalline FeRh are valuable ingredients for the predictive modeling of the acoustic and magnetoacoustic properties of this magnetostrictive material.

Original language	English
Article number	014427
Pages (from-to)	1-10
Number of pages	10
Journal	Physical Review B
Volume	110
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.110.014427
Publication status	Published - 18 Jul 2024

Bibliographical note

Publisher Copyright:
© 2024 American Physical Society.

Funding

This work has been partly supported by the French Agence Nationale de la Recherche (ANR ACAF 20-CE30-0027). Access to the CEITEC Nano Research Infrastructure was supported by the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic under the project CzechNanoLab (LM2023051). A.C. and M.J.V. acknowledge the Fonds de la Recherche Scientifique (FRS-FNRS Belgium) for PdR Grant No. T.0103.19 - ALPS, and ARC project DREAMS (G.A. 21/25-11) funded by F\u00E9d\u00E9ration Wallonie Bruxelles and ULiege. Simulation time was awarded by the Belgian share of EuroHPC in LUMI hosted by CSC in Finland, by the CECI (FRS-FNRS Belgium Grant No. 2.5020.11), as well as the Zenobe Tier-1 of the F\u00E9d\u00E9ration Wallonie-Bruxelles (Walloon Region Grant Agreement No. 1117545). We acknowledge the technical assistance of Mathieu Bernard from Institut des Nanosciences de Paris.

Funders	Funder number
ULiege
Belgian share of EuroHPC
ARC
Fonds De La Recherche Scientifique - FNRS
Fédération Wallonie-Bruxelles
CSC
Ministerstvo Školství, Mládeže a Tělovýchovy
Agence Nationale de la Recherche	ANR ACAF 20-CE30-0027
MEYS	LM2023051
CECI	2.5020.11
Walloon Region	1117545

Keywords

Generation
Phonons
Transition

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PhysRevB.110.014427Final published version, 2.24 MB

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title = "Experimental determination of the temperature- and phase-dependent elastic constants of FeRh",

abstract = "The elastic constants of an epitaxial film of FeRh have been determined experimentally in both ferromagnetic (FM) and antiferromagnetic (AF) phases, using a combination of Brillouin light scattering and picosecond acoustics experiments. The C11 constant is noticeably larger in the FM phase than in the AF phase, while C12 and C44 are both lower, leading to larger Rayleigh wave velocities in the FM phase than in the AF phase. The elastic constants were calculated numerically using first-principles anharmonic modeling and machinelearned interatomic potentials. We find that using a temperature-dependent effective potential is indispensable to correctly reproduce the experimental values to within 80-100\%. The accurate knowledge of the temperatureand phase-dependences of the elastic constants of crystalline FeRh are valuable ingredients for the predictive modeling of the acoustic and magnetoacoustic properties of this magnetostrictive material.",

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doi = "10.1103/PhysRevB.110.014427",

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AU - Ourdani, D.

AU - Castellano, A.

AU - Vythelingum, A. K.

AU - Arregi, J. A.

AU - Uhlir, V.

AU - Perrin, B.

AU - Belmeguenai, M.

AU - Roussigne, Y.

AU - Gourdon, C.

AU - Verstraete, M. J.

AU - Thevenard, L.

PY - 2024/7/18

Y1 - 2024/7/18

N2 - The elastic constants of an epitaxial film of FeRh have been determined experimentally in both ferromagnetic (FM) and antiferromagnetic (AF) phases, using a combination of Brillouin light scattering and picosecond acoustics experiments. The C11 constant is noticeably larger in the FM phase than in the AF phase, while C12 and C44 are both lower, leading to larger Rayleigh wave velocities in the FM phase than in the AF phase. The elastic constants were calculated numerically using first-principles anharmonic modeling and machinelearned interatomic potentials. We find that using a temperature-dependent effective potential is indispensable to correctly reproduce the experimental values to within 80-100%. The accurate knowledge of the temperatureand phase-dependences of the elastic constants of crystalline FeRh are valuable ingredients for the predictive modeling of the acoustic and magnetoacoustic properties of this magnetostrictive material.

AB - The elastic constants of an epitaxial film of FeRh have been determined experimentally in both ferromagnetic (FM) and antiferromagnetic (AF) phases, using a combination of Brillouin light scattering and picosecond acoustics experiments. The C11 constant is noticeably larger in the FM phase than in the AF phase, while C12 and C44 are both lower, leading to larger Rayleigh wave velocities in the FM phase than in the AF phase. The elastic constants were calculated numerically using first-principles anharmonic modeling and machinelearned interatomic potentials. We find that using a temperature-dependent effective potential is indispensable to correctly reproduce the experimental values to within 80-100%. The accurate knowledge of the temperatureand phase-dependences of the elastic constants of crystalline FeRh are valuable ingredients for the predictive modeling of the acoustic and magnetoacoustic properties of this magnetostrictive material.

KW - Generation

KW - Phonons

KW - Transition

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JF - Physical Review B

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M1 - 014427

ER -

Experimental determination of the temperature- and phase-dependent elastic constants of FeRh

Abstract

Bibliographical note

Funding

Keywords

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