Antiferromagnetics; Data encoding; Ferromagnetic phasis; Ferromagnetic transitions; Laser-assisted; Magnetic phase; Near room temperature; Thermal; Thermoreflectance; Thin-films; Materials Science (all); Physics and Astronomy (miscellaneous)
Abstract :
[en] FeRh is well known in its bulk form for a temperature-driven antiferromagnetic (AFM) to ferromagnetic (FM) transition near room temperature. It has aroused renewed interest in its thin-film form, with particular focus on its biaxial AFM magnetic anisotropy which could serve for data encoding, and the possibility to investigate laser-assisted phase transitions, with varying contributions from electrons, phonons, and magnons. In order to estimate the typical temperature increase occurring in these experiments, we performed modulated thermoreflectance microscopy to determine the thermal conductivity κ of FeRh. As often occurs upon alloying, and despite the good crystallinity of the layer, κ was found to be lower than the thermal conductivities of its constituting elements. More unexpectedly, given the electrically more conducting nature of the FM phase, it turned out to be three times lower in the FM phase compared to the AFM phase. This trend was confirmed by examining the temporal decay of incoherent phonons generated by a pulsed laser in both phases. To elucidate these results, first- and second-principles simulations were performed to estimate the phonon, magnon, and electron contributions to the thermal conductivity. They were found to be of the same order of magnitude, and to give a quantitative rendering of the experimentally observed κAFM. In the FM phase, however, simulations overestimate the low experimental values, implying very different (shorter) electron and magnon lifetimes.
Research Center/Unit :
Q-MAT - Quantum Materials - ULiège
Disciplines :
Physics
Author, co-author :
Castellano, Aloïs ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures
Alhada-Lahbabi, K.; Sorbonne Université, CNRS, Institut des Nanosciences de Paris, Paris, France
Arregi, J.A. ; CEITEC BUT, Brno University of Technology, Brno, Czech Republic
Uhlíř, V. ; CEITEC BUT, Brno University of Technology, Brno, Czech Republic ; Institute of Physical Engineering, Brno University of Technology, Brno, Czech Republic
Perrin, B.; Sorbonne Université, CNRS, Institut des Nanosciences de Paris, Paris, France
Gourdon, C. ; Sorbonne Université, CNRS, Institut des Nanosciences de Paris, Paris, France
Fournier, D.; Sorbonne Université, CNRS, Institut des Nanosciences de Paris, Paris, France
Verstraete, Matthieu ; Université de Liège - ULiège > Département de physique > Physique des matériaux et nanostructures ; Institute for Theoretical Physics, Physics Department, Utrecht University, Utrecht, Netherlands
Thevenard, L. ; Sorbonne Université, CNRS, Institut des Nanosciences de Paris, Paris, France
Language :
English
Title :
Magnetic phase dependency of the thermal conductivity of FeRh from thermoreflectance experiments and numerical simulations
Publication date :
August 2024
Journal title :
Physical Review Materials
eISSN :
2475-9953
Publisher :
American Physical Society
Volume :
8
Issue :
8
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif Tier-1 supercalculateur
ANR - Agence Nationale de la Recherche MSMT - Ministerstvo školství, mládeže a tělovýchovy České republiky F.R.S.-FNRS - Fonds de la Recherche Scientifique Waalse Gewest EOS - The Excellence Of Science Program
Funding text :
This work has been partly supported by the French Agence Nationale de la Recherche (ANR ACAF 20-CE30-0027). We acknowledge M. Vabre (Institut des Nanosciences de Paris) for technical assistance. 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 Federation Wallonie Bruxelles and ULiege, and the Excellence of Science (EOS) program (Grant No. 40007563-CONNECT) funded by the FWO and F.R.S.-FNRS. 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).ACKNOWLEDGMENTS This work has been partly supported by the French Agence Nationale de la Recherche (ANR ACAF 20-CE30-0027). We acknowledge M. Vabre (Institut des Nanosciences de Paris) for technical assistance. 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 Federation Wallonie Bruxelles and ULiege, and the Excellence of Science (EOS) program (Grant No. 40007563-CONNECT) funded by the FWO and F.R.S.-FNRS. 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)
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